WordPressを読む　65-2 /blog/wp-includes/media.php 2

2014/12/04 2015/03/06

1 /blog/wp-includes/media.php 2
2 関数　image_make_intermediate_size()
3 関数　image_get_intermediate_size()
4 関数　get_intermediate_image_sizes()
5 関数　wp_get_attachment_image_src()
6 関数　wp_get_attachment_image()
7 関数　_wp_post_thumbnail_class_filter()
8 関数　_wp_post_thumbnail_class_filter_add()
9 関数　_wp_post_thumbnail_class_filter_remove()
10 関数間の処理　フックポイント
11 関数　img_caption_shortcode()
12 関数間の処理　フックポイント
13 関数　gallery_shortcode()

/blog/wp-includes/media.php 2

関数　image_make_intermediate_size()

/**
 * Resize an image to make a thumbnail or intermediate size.
 *
 * The returned array has the file size, the image width, and image height. The
 * filter 'image_make_intermediate_size' can be used to hook in and change the
 * values of the returned array. The only parameter is the resized file path.
 *
 * @since 2.5.0
 *
 * @param string $file File path.
 * @param int $width Image width.
 * @param int $height Image height.
 * @param bool $crop Optional, default is false. Whether to crop image to specified height and width or resize.
 * @return bool|array False, if no image was created. Metadata array on success.
 */
function image_make_intermediate_size( $file, $width, $height, $crop = false ) {
	if ( $width || $height ) {
		$editor = wp_get_image_editor( $file );

		if ( is_wp_error( $editor ) || is_wp_error( $editor->resize( $width, $height, $crop ) ) )
			return false;

		$resized_file = $editor->save();

		if ( ! is_wp_error( $resized_file ) && $resized_file ) {
			unset( $resized_file['path'] );
			return $resized_file;
		}
	}
	return false;
}

/**

* Resize an image to make a thumbnail or intermediate size.

* The returned array has the file size, the image width, and image height. The

* filter 'image_make_intermediate_size' can be used to hook in and change the

* values of the returned array. The only parameter is the resized file path.

* @since 2.5.0

* @param string $file File path.

* @param int $width Image width.

* @param int $height Image height.

* @param bool $crop Optional, default is false. Whether to crop image to specified height and width or resize.

* @return bool|array False, if no image was created. Metadata array on success.

function image_make_intermediate_size( $file, $width, $height, $crop = false ) {

if ( $width || $height ) {

$editor = wp_get_image_editor( $file );

if ( is_wp_error( $editor ) || is_wp_error( $editor->resize( $width, $height, $crop ) ) )

return false;

$resized_file = $editor->save();

if ( ! is_wp_error( $resized_file ) && $resized_file ) {

unset( $resized_file['path'] );

return $resized_file;

}

return false;

}

関数　image_get_intermediate_size()

/**
 * Retrieve the image's intermediate size (resized) path, width, and height.
 *
 * The $size parameter can be an array with the width and height respectively.
 * If the size matches the 'sizes' metadata array for width and height, then it
 * will be used. If there is no direct match, then the nearest image size larger
 * than the specified size will be used. If nothing is found, then the function
 * will break out and return false.
 *
 * The metadata 'sizes' is used for compatible sizes that can be used for the
 * parameter $size value.
 *
 * The url path will be given, when the $size parameter is a string.
 *
 * If you are passing an array for the $size, you should consider using
 * add_image_size() so that a cropped version is generated. It's much more
 * efficient than having to find the closest-sized image and then having the
 * browser scale down the image.
 *
 * @since 2.5.0
 * @see add_image_size()
 *
 * @param int $post_id Attachment ID for image.
 * @param array|string $size Optional, default is 'thumbnail'. Size of image, either array or string.
 * @return bool|array False on failure or array of file path, width, and height on success.
 */
function image_get_intermediate_size($post_id, $size='thumbnail') {
	if ( !is_array( $imagedata = wp_get_attachment_metadata( $post_id ) ) )
		return false;

	// get the best one for a specified set of dimensions
	if ( is_array($size) && !empty($imagedata['sizes']) ) {
		foreach ( $imagedata['sizes'] as $_size => $data ) {
			// already cropped to width or height; so use this size
			if ( ( $data['width'] == $size[0] && $data['height'] <= $size[1] ) || ( $data['height'] == $size[1] && $data['width'] <= $size[0] ) ) {
				$file = $data['file'];
				list($width, $height) = image_constrain_size_for_editor( $data['width'], $data['height'], $size );
				return compact( 'file', 'width', 'height' );
			}
			// add to lookup table: area => size
			$areas[$data['width'] * $data['height']] = $_size;
		}
		if ( !$size || !empty($areas) ) {
			// find for the smallest image not smaller than the desired size
			ksort($areas);
			foreach ( $areas as $_size ) {
				$data = $imagedata['sizes'][$_size];
				if ( $data['width'] >= $size[0] || $data['height'] >= $size[1] ) {
					// Skip images with unexpectedly divergent aspect ratios (crops)
					// First, we calculate what size the original image would be if constrained to a box the size of the current image in the loop
					$maybe_cropped = image_resize_dimensions($imagedata['width'], $imagedata['height'], $data['width'], $data['height'], false );
					// If the size doesn't match within one pixel, then it is of a different aspect ratio, so we skip it, unless it's the thumbnail size
					if ( 'thumbnail' != $_size && ( !$maybe_cropped || ( $maybe_cropped[4] != $data['width'] && $maybe_cropped[4] + 1 != $data['width'] ) || ( $maybe_cropped[5] != $data['height'] && $maybe_cropped[5] + 1 != $data['height'] ) ) )
						continue;
					// If we're still here, then we're going to use this size
					$file = $data['file'];
					list($width, $height) = image_constrain_size_for_editor( $data['width'], $data['height'], $size );
					return compact( 'file', 'width', 'height' );
				}
			}
		}
	}

	if ( is_array($size) || empty($size) || empty($imagedata['sizes'][$size]) )
		return false;

	$data = $imagedata['sizes'][$size];
	// include the full filesystem path of the intermediate file
	if ( empty($data['path']) && !empty($data['file']) ) {
		$file_url = wp_get_attachment_url($post_id);
		$data['path'] = path_join( dirname($imagedata['file']), $data['file'] );
		$data['url'] = path_join( dirname($file_url), $data['file'] );
	}
	return $data;
}

/**

* Retrieve the image's intermediate size (resized) path, width, and height.

* The $size parameter can be an array with the width and height respectively.

* If the size matches the 'sizes' metadata array for width and height, then it

* will be used. If there is no direct match, then the nearest image size larger

* than the specified size will be used. If nothing is found, then the function

* will break out and return false.

* The metadata 'sizes' is used for compatible sizes that can be used for the

* parameter $size value.

* The url path will be given, when the $size parameter is a string.

* If you are passing an array for the $size, you should consider using

* add_image_size() so that a cropped version is generated. It's much more

* efficient than having to find the closest-sized image and then having the

* browser scale down the image.

* @since 2.5.0

* @see add_image_size()

* @param int $post_id Attachment ID for image.

* @param array|string $size Optional, default is 'thumbnail'. Size of image, either array or string.

* @return bool|array False on failure or array of file path, width, and height on success.

function image_get_intermediate_size($post_id, $size='thumbnail') {

if ( !is_array( $imagedata = wp_get_attachment_metadata( $post_id ) ) )

return false;

// get the best one for a specified set of dimensions

if ( is_array($size) && !empty($imagedata['sizes']) ) {

foreach ( $imagedata['sizes'] as $_size => $data ) {

// already cropped to width or height; so use this size

if ( ( $data['width'] == $size[0] && $data['height'] <= $size[1] ) || ( $data['height'] == $size[1] && $data['width'] <= $size[0] ) ) {

$file = $data['file'];

list($width, $height) = image_constrain_size_for_editor( $data['width'], $data['height'], $size );

return compact( 'file', 'width', 'height' );

}

// add to lookup table: area => size

$areas[$data['width'] * $data['height']] = $_size;

}

if ( !$size || !empty($areas) ) {

// find for the smallest image not smaller than the desired size

ksort($areas);

foreach ( $areas as $_size ) {

$data = $imagedata['sizes'][$_size];

if ( $data['width'] >= $size[0] || $data['height'] >= $size[1] ) {

// Skip images with unexpectedly divergent aspect ratios (crops)

// First, we calculate what size the original image would be if constrained to a box the size of the current image in the loop

$maybe_cropped = image_resize_dimensions($imagedata['width'], $imagedata['height'], $data['width'], $data['height'], false );

// If the size doesn't match within one pixel, then it is of a different aspect ratio, so we skip it, unless it's the thumbnail size

if ( 'thumbnail' != $_size && ( !$maybe_cropped || ( $maybe_cropped[4] != $data['width'] && $maybe_cropped[4] + 1 != $data['width'] ) || ( $maybe_cropped[5] != $data['height'] && $maybe_cropped[5] + 1 != $data['height'] ) ) )

continue;

// If we're still here, then we're going to use this size

$file = $data['file'];

list($width, $height) = image_constrain_size_for_editor( $data['width'], $data['height'], $size );

return compact( 'file', 'width', 'height' );

}

if ( is_array($size) || empty($size) || empty($imagedata['sizes'][$size]) )

return false;

$data = $imagedata['sizes'][$size];

// include the full filesystem path of the intermediate file

if ( empty($data['path']) && !empty($data['file']) ) {

$file_url = wp_get_attachment_url($post_id);

$data['path'] = path_join( dirname($imagedata['file']), $data['file'] );

$data['url'] = path_join( dirname($file_url), $data['file'] );

}

return $data;

}

関数　get_intermediate_image_sizes()

/**
 * Get the available image sizes
 * @since 3.0.0
 * @return array Returns a filtered array of image size strings
 */
function get_intermediate_image_sizes() {
	global $_wp_additional_image_sizes;
	$image_sizes = array('thumbnail', 'medium', 'large'); // Standard sizes
	if ( isset( $_wp_additional_image_sizes ) && count( $_wp_additional_image_sizes ) )
		$image_sizes = array_merge( $image_sizes, array_keys( $_wp_additional_image_sizes ) );

	/**
	 * Filter the list of intermediate image sizes.
	 *
	 * @since 2.5.0
	 *
	 * @param array $image_sizes An array of intermediate image sizes. Defaults
	 *                           are 'thumbnail', 'medium', 'large'.
	 */
	return apply_filters( 'intermediate_image_sizes', $image_sizes );
}

/**

* Get the available image sizes

* @since 3.0.0

* @return array Returns a filtered array of image size strings

function get_intermediate_image_sizes() {

global $_wp_additional_image_sizes;

$image_sizes = array('thumbnail', 'medium', 'large'); // Standard sizes

if ( isset( $_wp_additional_image_sizes ) && count( $_wp_additional_image_sizes ) )

$image_sizes = array_merge( $image_sizes, array_keys( $_wp_additional_image_sizes ) );

/**

* Filter the list of intermediate image sizes.

* @since 2.5.0

* @param array $image_sizes An array of intermediate image sizes. Defaults

* are 'thumbnail', 'medium', 'large'.

return apply_filters( 'intermediate_image_sizes', $image_sizes );

}

関数　wp_get_attachment_image_src()

/**
 * Retrieve an image to represent an attachment.
 *
 * A mime icon for files, thumbnail or intermediate size for images.
 *
 * @since 2.5.0
 *
 * @param int $attachment_id Image attachment ID.
 * @param string $size Optional, default is 'thumbnail'.
 * @param bool $icon Optional, default is false. Whether it is an icon.
 * @return bool|array Returns an array (url, width, height), or false, if no image is available.
 */
function wp_get_attachment_image_src($attachment_id, $size='thumbnail', $icon = false) {

	// get a thumbnail or intermediate image if there is one
	if ( $image = image_downsize($attachment_id, $size) )
		return $image;

	$src = false;

	if ( $icon && $src = wp_mime_type_icon($attachment_id) ) {
		/** This filter is documented in wp-includes/post.php */
		$icon_dir = apply_filters( 'icon_dir', ABSPATH . WPINC . '/images/media' );
		$src_file = $icon_dir . '/' . wp_basename($src);
		@list($width, $height) = getimagesize($src_file);
	}
	if ( $src && $width && $height )
		return array( $src, $width, $height );
	return false;
}

/**

* Retrieve an image to represent an attachment.

* A mime icon for files, thumbnail or intermediate size for images.

* @since 2.5.0

* @param int $attachment_id Image attachment ID.

* @param string $size Optional, default is 'thumbnail'.

* @param bool $icon Optional, default is false. Whether it is an icon.

* @return bool|array Returns an array (url, width, height), or false, if no image is available.

function wp_get_attachment_image_src($attachment_id, $size='thumbnail', $icon = false) {

// get a thumbnail or intermediate image if there is one

if ( $image = image_downsize($attachment_id, $size) )

return $image;

$src = false;

if ( $icon && $src = wp_mime_type_icon($attachment_id) ) {

/** This filter is documented in wp-includes/post.php */

$icon_dir = apply_filters( 'icon_dir', ABSPATH . WPINC . '/images/media' );

$src_file = $icon_dir . '/' . wp_basename($src);

@list($width, $height) = getimagesize($src_file);

}

if ( $src && $width && $height )

return array( $src, $width, $height );

return false;

}

関数　wp_get_attachment_image()

/**
 * Get an HTML img element representing an image attachment
 *
 * While $size will accept an array, it is better to register a size with
 * add_image_size() so that a cropped version is generated. It's much more
 * efficient than having to find the closest-sized image and then having the
 * browser scale down the image.
 *
 * @since 2.5.0
 *
 * @see add_image_size()
 * @uses wp_get_attachment_image_src() Gets attachment file URL and dimensions
 *
 * @param int $attachment_id Image attachment ID.
 * @param string $size Optional, default is 'thumbnail'.
 * @param bool $icon Optional, default is false. Whether it is an icon.
 * @param mixed $attr Optional, attributes for the image markup.
 * @return string HTML img element or empty string on failure.
 */
function wp_get_attachment_image($attachment_id, $size = 'thumbnail', $icon = false, $attr = '') {

	$html = '';
	$image = wp_get_attachment_image_src($attachment_id, $size, $icon);
	if ( $image ) {
		list($src, $width, $height) = $image;
		$hwstring = image_hwstring($width, $height);
		if ( is_array($size) )
			$size = join('x', $size);
		$attachment = get_post($attachment_id);
		$default_attr = array(
			'src'	=> $src,
			'class'	=> "attachment-$size",
			'alt'	=> trim(strip_tags( get_post_meta($attachment_id, '_wp_attachment_image_alt', true) )), // Use Alt field first
		);
		if ( empty($default_attr['alt']) )
			$default_attr['alt'] = trim(strip_tags( $attachment->post_excerpt )); // If not, Use the Caption
		if ( empty($default_attr['alt']) )
			$default_attr['alt'] = trim(strip_tags( $attachment->post_title )); // Finally, use the title

		$attr = wp_parse_args($attr, $default_attr);

		/**
		 * Filter the list of attachment image attributes.
		 *
		 * @since 2.8.0
		 *
		 * @param mixed $attr          Attributes for the image markup.
		 * @param int   $attachment_id Image attachment ID.
		 */
		$attr = apply_filters( 'wp_get_attachment_image_attributes', $attr, $attachment );
		$attr = array_map( 'esc_attr', $attr );
		$html = rtrim("<img $hwstring");
		foreach ( $attr as $name => $value ) {
			$html .= " $name=" . '"' . $value . '"';
		}
		$html .= ' />';
	}

	return $html;
}

/**

* Get an HTML img element representing an image attachment

* While $size will accept an array, it is better to register a size with

* add_image_size() so that a cropped version is generated. It's much more

* efficient than having to find the closest-sized image and then having the

* browser scale down the image.

* @since 2.5.0

* @see add_image_size()

* @uses wp_get_attachment_image_src() Gets attachment file URL and dimensions

* @param int $attachment_id Image attachment ID.

* @param string $size Optional, default is 'thumbnail'.

* @param bool $icon Optional, default is false. Whether it is an icon.

* @param mixed $attr Optional, attributes for the image markup.

* @return string HTML img element or empty string on failure.

function wp_get_attachment_image($attachment_id, $size = 'thumbnail', $icon = false, $attr = '') {

$html = '';

$image = wp_get_attachment_image_src($attachment_id, $size, $icon);

if ( $image ) {

list($src, $width, $height) = $image;

$hwstring = image_hwstring($width, $height);

if ( is_array($size) )

$size = join('x', $size);

$attachment = get_post($attachment_id);

$default_attr = array(

'src' => $src,

'class' => "attachment-$size",

'alt' => trim(strip_tags( get_post_meta($attachment_id, '_wp_attachment_image_alt', true) )), // Use Alt field first

);

if ( empty($default_attr['alt']) )

$default_attr['alt'] = trim(strip_tags( $attachment->post_excerpt )); // If not, Use the Caption

if ( empty($default_attr['alt']) )

$default_attr['alt'] = trim(strip_tags( $attachment->post_title )); // Finally, use the title

$attr = wp_parse_args($attr, $default_attr);

/**

* Filter the list of attachment image attributes.

* @since 2.8.0

* @param mixed $attr Attributes for the image markup.

* @param int $attachment_id Image attachment ID.

$attr = apply_filters( 'wp_get_attachment_image_attributes', $attr, $attachment );

$attr = array_map( 'esc_attr', $attr );

$html = rtrim("<img $hwstring");

foreach ( $attr as $name => $value ) {

$html .= " $name=" . '"' . $value . '"';

}

$html .= ' />';

}

return $html;

}

関数　_wp_post_thumbnail_class_filter()

/**
 * Adds a 'wp-post-image' class to post thumbnails
 * Uses the begin_fetch_post_thumbnail_html and end_fetch_post_thumbnail_html action hooks to
 * dynamically add/remove itself so as to only filter post thumbnails
 *
 * @since 2.9.0
 * @param array $attr Attributes including src, class, alt, title
 * @return array
 */
function _wp_post_thumbnail_class_filter( $attr ) {
	$attr['class'] .= ' wp-post-image';
	return $attr;
}

/**

* Adds a 'wp-post-image' class to post thumbnails

* Uses the begin_fetch_post_thumbnail_html and end_fetch_post_thumbnail_html action hooks to

* dynamically add/remove itself so as to only filter post thumbnails

* @since 2.9.0

* @param array $attr Attributes including src, class, alt, title

* @return array

function _wp_post_thumbnail_class_filter( $attr ) {

$attr['class'] .= ' wp-post-image';

return $attr;

}

関数　_wp_post_thumbnail_class_filter_add()

/**
 * Adds _wp_post_thumbnail_class_filter to the wp_get_attachment_image_attributes filter
 *
 * @since 2.9.0
 */
function _wp_post_thumbnail_class_filter_add( $attr ) {
	add_filter( 'wp_get_attachment_image_attributes', '_wp_post_thumbnail_class_filter' );
}

/**

* Adds _wp_post_thumbnail_class_filter to the wp_get_attachment_image_attributes filter

* @since 2.9.0

function _wp_post_thumbnail_class_filter_add( $attr ) {

add_filter( 'wp_get_attachment_image_attributes', '_wp_post_thumbnail_class_filter' );

}

関数　_wp_post_thumbnail_class_filter_remove()

/**
 * Removes _wp_post_thumbnail_class_filter from the wp_get_attachment_image_attributes filter
 *
 * @since 2.9.0
 */
function _wp_post_thumbnail_class_filter_remove( $attr ) {
	remove_filter( 'wp_get_attachment_image_attributes', '_wp_post_thumbnail_class_filter' );
}

/**

* Removes _wp_post_thumbnail_class_filter from the wp_get_attachment_image_attributes filter

* @since 2.9.0

function _wp_post_thumbnail_class_filter_remove( $attr ) {

remove_filter( 'wp_get_attachment_image_attributes', '_wp_post_thumbnail_class_filter' );

}

関数間の処理　フックポイント

add_shortcode('wp_caption', 'img_caption_shortcode');
add_shortcode('caption', 'img_caption_shortcode');

1 2	add_shortcode('wp_caption', 'img_caption_shortcode'); add_shortcode('caption', 'img_caption_shortcode');

関数　img_caption_shortcode()

/**
 * The Caption shortcode.
 *
 * Allows a plugin to replace the content that would otherwise be returned. The
 * filter is 'img_caption_shortcode' and passes an empty string, the attr
 * parameter and the content parameter values.
 *
 * The supported attributes for the shortcode are 'id', 'align', 'width', and
 * 'caption'.
 *
 * @since 2.6.0
 *
 * @param array $attr {
 *     Attributes of the caption shortcode.
 *
 *     @type string $id      ID of the div element for the caption.
 *     @type string $align   Class name that aligns the caption. Default 'alignnone'. Accepts 'alignleft',
 *                           'aligncenter', alignright', 'alignnone'.
 *     @type int    $width   The width of the caption, in pixels.
 *     @type string $caption The caption text.
 *     @type string $class   Additional class name(s) added to the caption container.
 * }
 * @param string $content Optional. Shortcode content.
 * @return string HTML content to display the caption.
 */
function img_caption_shortcode( $attr, $content = null ) {
	// New-style shortcode with the caption inside the shortcode with the link and image tags.
	if ( ! isset( $attr['caption'] ) ) {
		if ( preg_match( '#((?:<a [^>]+>\s*)?<img [^>]+>(?:\s*</a>)?)(.*)#is', $content, $matches ) ) {
			$content = $matches[1];
			$attr['caption'] = trim( $matches[2] );
		}
	}

	/**
	 * Filter the default caption shortcode output.
	 *
	 * If the filtered output isn't empty, it will be used instead of generating
	 * the default caption template.
	 *
	 * @since 2.6.0
	 *
	 * @see img_caption_shortcode()
	 *
	 * @param string $output  The caption output. Default empty.
	 * @param array  $attr    Attributes of the caption shortcode.
	 * @param string $content The image element, possibly wrapped in a hyperlink.
	 */
	$output = apply_filters( 'img_caption_shortcode', '', $attr, $content );
	if ( $output != '' )
		return $output;

	$atts = shortcode_atts( array(
		'id'	  => '',
		'align'	  => 'alignnone',
		'width'	  => '',
		'caption' => '',
		'class'   => '',
	), $attr, 'caption' );

	$atts['width'] = (int) $atts['width'];
	if ( $atts['width'] < 1 || empty( $atts['caption'] ) )
		return $content;

	if ( ! empty( $atts['id'] ) )
		$atts['id'] = 'id="' . esc_attr( $atts['id'] ) . '" ';

	$class = trim( 'wp-caption ' . $atts['align'] . ' ' . $atts['class'] );

	if ( current_theme_supports( 'html5', 'caption' ) ) {
		return '<figure ' . $atts['id'] . 'style="width: ' . (int) $atts['width'] . 'px;" class="' . esc_attr( $class ) . '">'
		. do_shortcode( $content ) . '<figcaption class="wp-caption-text">' . $atts['caption'] . '</figcaption></figure>';
	}

	$caption_width = 10 + $atts['width'];

	/**
	 * Filter the width of an image's caption.
	 *
	 * By default, the caption is 10 pixels greater than the width of the image,
	 * to prevent post content from running up against a floated image.
	 *
	 * @since 3.7.0
	 *
	 * @see img_caption_shortcode()
	 *
	 * @param int    $caption_width Width of the caption in pixels. To remove this inline style,
	 *                              return zero.
	 * @param array  $atts          Attributes of the caption shortcode.
	 * @param string $content       The image element, possibly wrapped in a hyperlink.
	 */
	$caption_width = apply_filters( 'img_caption_shortcode_width', $caption_width, $atts, $content );

	$style = '';
	if ( $caption_width )
		$style = 'style="width: ' . (int) $caption_width . 'px" ';

	return '<div ' . $atts['id'] . $style . 'class="' . esc_attr( $class ) . '">'
	. do_shortcode( $content ) . '<p class="wp-caption-text">' . $atts['caption'] . '</p></div>';
}

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/**

* The Caption shortcode.

* Allows a plugin to replace the content that would otherwise be returned. The

* filter is 'img_caption_shortcode' and passes an empty string, the attr

* parameter and the content parameter values.

* The supported attributes for the shortcode are 'id', 'align', 'width', and

* 'caption'.

* @since 2.6.0

* @param array $attr {

* Attributes of the caption shortcode.

* @type string $id ID of the div element for the caption.

* @type string $align Class name that aligns the caption. Default 'alignnone'. Accepts 'alignleft',

* 'aligncenter', alignright', 'alignnone'.

* @type int $width The width of the caption, in pixels.

* @type string $caption The caption text.

* @type string $class Additional class name(s) added to the caption container.

* }

* @param string $content Optional. Shortcode content.

* @return string HTML content to display the caption.

function img_caption_shortcode( $attr, $content = null ) {

// New-style shortcode with the caption inside the shortcode with the link and image tags.

if ( ! isset( $attr['caption'] ) ) {

if ( preg_match( '#((?:<a [^>]+>\s*)?<img [^>]+>(?:\s*</a>)?)(.*)#is', $content, $matches ) ) {

$content = $matches[1];

$attr['caption'] = trim( $matches[2] );

}

/**

* Filter the default caption shortcode output.

* If the filtered output isn't empty, it will be used instead of generating

* the default caption template.

* @since 2.6.0

* @see img_caption_shortcode()

* @param string $output The caption output. Default empty.

* @param array $attr Attributes of the caption shortcode.

* @param string $content The image element, possibly wrapped in a hyperlink.

$output = apply_filters( 'img_caption_shortcode', '', $attr, $content );

if ( $output != '' )

return $output;

$atts = shortcode_atts( array(

'id' => '',

'align' => 'alignnone',

'width' => '',

'caption' => '',

'class' => '',

), $attr, 'caption' );

$atts['width'] = (int) $atts['width'];

if ( $atts['width'] < 1 || empty( $atts['caption'] ) )

return $content;

if ( ! empty( $atts['id'] ) )

$atts['id'] = 'id="' . esc_attr( $atts['id'] ) . '" ';

$class = trim( 'wp-caption ' . $atts['align'] . ' ' . $atts['class'] );

if ( current_theme_supports( 'html5', 'caption' ) ) {

return '<figure ' . $atts['id'] . 'style="width: ' . (int) $atts['width'] . 'px;" class="' . esc_attr( $class ) . '">'

. do_shortcode( $content ) . '<figcaption class="wp-caption-text">' . $atts['caption'] . '</figcaption></figure>';

}

$caption_width = 10 + $atts['width'];

/**

* Filter the width of an image's caption.

* By default, the caption is 10 pixels greater than the width of the image,

* to prevent post content from running up against a floated image.

* @since 3.7.0

* @see img_caption_shortcode()

* @param int $caption_width Width of the caption in pixels. To remove this inline style,

* return zero.

* @param array $atts Attributes of the caption shortcode.

* @param string $content The image element, possibly wrapped in a hyperlink.

$caption_width = apply_filters( 'img_caption_shortcode_width', $caption_width, $atts, $content );

$style = '';

if ( $caption_width )

$style = 'style="width: ' . (int) $caption_width . 'px" ';

return '<div ' . $atts['id'] . $style . 'class="' . esc_attr( $class ) . '">'

. do_shortcode( $content ) . '<p class="wp-caption-text">' . $atts['caption'] . '</p></div>';

}

関数間の処理　フックポイント

add_shortcode('gallery', 'gallery_shortcode');

1	add_shortcode('gallery', 'gallery_shortcode');

関数　gallery_shortcode()

/**
 * The Gallery shortcode.
 *
 * This implements the functionality of the Gallery Shortcode for displaying
 * WordPress images on a post.
 *
 * @since 2.5.0
 *
 * @param array $attr {
 *     Attributes of the gallery shortcode.
 *
 *     @type string $order      Order of the images in the gallery. Default 'ASC'. Accepts 'ASC', 'DESC'.
 *     @type string $orderby    The field to use when ordering the images. Default 'menu_order ID'.
 *                              Accepts any valid SQL ORDERBY statement.
 *     @type int    $id         Post ID.
 *     @type string $itemtag    HTML tag to use for each image in the gallery.
 *                              Default 'dl', or 'figure' when the theme registers HTML5 gallery support.
 *     @type string $icontag    HTML tag to use for each image's icon.
 *                              Default 'dt', or 'div' when the theme registers HTML5 gallery support.
 *     @type string $captiontag HTML tag to use for each image's caption.
 *                              Default 'dd', or 'figcaption' when the theme registers HTML5 gallery support.
 *     @type int    $columns    Number of columns of images to display. Default 3.
 *     @type string $size       Size of the images to display. Default 'thumbnail'.
 *     @type string $ids        A comma-separated list of IDs of attachments to display. Default empty.
 *     @type string $include    A comma-separated list of IDs of attachments to include. Default empty.
 *     @type string $exclude    A comma-separated list of IDs of attachments to exclude. Default empty.
 *     @type string $link       What to link each image to. Default empty (links to the attachment page).
 *                              Accepts 'file', 'none'.
 * }
 * @return string HTML content to display gallery.
 */
function gallery_shortcode( $attr ) {
	$post = get_post();

	static $instance = 0;
	$instance++;

	if ( ! empty( $attr['ids'] ) ) {
		// 'ids' is explicitly ordered, unless you specify otherwise.
		if ( empty( $attr['orderby'] ) ) {
			$attr['orderby'] = 'post__in';
		}
		$attr['include'] = $attr['ids'];
	}

	/**
	 * Filter the default gallery shortcode output.
	 *
	 * If the filtered output isn't empty, it will be used instead of generating
	 * the default gallery template.
	 *
	 * @since 2.5.0
	 *
	 * @see gallery_shortcode()
	 *
	 * @param string $output The gallery output. Default empty.
	 * @param array  $attr   Attributes of the gallery shortcode.
	 */
	$output = apply_filters( 'post_gallery', '', $attr );
	if ( $output != '' ) {
		return $output;
	}

	// We're trusting author input, so let's at least make sure it looks like a valid orderby statement
	if ( isset( $attr['orderby'] ) ) {
		$attr['orderby'] = sanitize_sql_orderby( $attr['orderby'] );
		if ( ! $attr['orderby'] ) {
			unset( $attr['orderby'] );
		}
	}

	$html5 = current_theme_supports( 'html5', 'gallery' );
	$atts = shortcode_atts( array(
		'order'      => 'ASC',
		'orderby'    => 'menu_order ID',
		'id'         => $post ? $post->ID : 0,
		'itemtag'    => $html5 ? 'figure'     : 'dl',
		'icontag'    => $html5 ? 'div'        : 'dt',
		'captiontag' => $html5 ? 'figcaption' : 'dd',
		'columns'    => 3,
		'size'       => 'thumbnail',
		'include'    => '',
		'exclude'    => '',
		'link'       => ''
	), $attr, 'gallery' );

	$id = intval( $atts['id'] );
	if ( 'RAND' == $atts['order'] ) {
		$atts['orderby'] = 'none';
	}

	if ( ! empty( $atts['include'] ) ) {
		$_attachments = get_posts( array( 'include' => $atts['include'], 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $atts['order'], 'orderby' => $atts['orderby'] ) );

		$attachments = array();
		foreach ( $_attachments as $key => $val ) {
			$attachments[$val->ID] = $_attachments[$key];
		}
	} elseif ( ! empty( $atts['exclude'] ) ) {
		$attachments = get_children( array( 'post_parent' => $id, 'exclude' => $atts['exclude'], 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $atts['order'], 'orderby' => $atts['orderby'] ) );
	} else {
		$attachments = get_children( array( 'post_parent' => $id, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $atts['order'], 'orderby' => $atts['orderby'] ) );
	}

	if ( empty( $attachments ) ) {
		return '';
	}

	if ( is_feed() ) {
		$output = "\n";
		foreach ( $attachments as $att_id => $attachment ) {
			$output .= wp_get_attachment_link( $att_id, $atts['size'], true ) . "\n";
		}
		return $output;
	}

	$itemtag = tag_escape( $atts['itemtag'] );
	$captiontag = tag_escape( $atts['captiontag'] );
	$icontag = tag_escape( $atts['icontag'] );
	$valid_tags = wp_kses_allowed_html( 'post' );
	if ( ! isset( $valid_tags[ $itemtag ] ) ) {
		$itemtag = 'dl';
	}
	if ( ! isset( $valid_tags[ $captiontag ] ) ) {
		$captiontag = 'dd';
	}
	if ( ! isset( $valid_tags[ $icontag ] ) ) {
		$icontag = 'dt';
	}

	$columns = intval( $atts['columns'] );
	$itemwidth = $columns > 0 ? floor(100/$columns) : 100;
	$float = is_rtl() ? 'right' : 'left';

	$selector = "gallery-{$instance}";

	$gallery_style = '';

	/**
	 * Filter whether to print default gallery styles.
	 *
	 * @since 3.1.0
	 *
	 * @param bool $print Whether to print default gallery styles.
	 *                    Defaults to false if the theme supports HTML5 galleries.
	 *                    Otherwise, defaults to true.
	 */
	if ( apply_filters( 'use_default_gallery_style', ! $html5 ) ) {
		$gallery_style = "
		<style type='text/css'>
			#{$selector} {
				margin: auto;
			}
			#{$selector} .gallery-item {
				float: {$float};
				margin-top: 10px;
				text-align: center;
				width: {$itemwidth}%;
			}
			#{$selector} img {
				border: 2px solid #cfcfcf;
			}
			#{$selector} .gallery-caption {
				margin-left: 0;
			}
			/* see gallery_shortcode() in wp-includes/media.php */
		</style>\n\t\t";
	}

	$size_class = sanitize_html_class( $atts['size'] );
	$gallery_div = "<div id='$selector' class='gallery galleryid-{$id} gallery-columns-{$columns} gallery-size-{$size_class}'>";

	/**
	 * Filter the default gallery shortcode CSS styles.
	 *
	 * @since 2.5.0
	 *
	 * @param string $gallery_style Default gallery shortcode CSS styles.
	 * @param string $gallery_div   Opening HTML div container for the gallery shortcode output.
	 */
	$output = apply_filters( 'gallery_style', $gallery_style . $gallery_div );

	$i = 0;
	foreach ( $attachments as $id => $attachment ) {
		if ( ! empty( $atts['link'] ) && 'file' === $atts['link'] ) {
			$image_output = wp_get_attachment_link( $id, $atts['size'], false, false );
		} elseif ( ! empty( $atts['link'] ) && 'none' === $atts['link'] ) {
			$image_output = wp_get_attachment_image( $id, $atts['size'], false );
		} else {
			$image_output = wp_get_attachment_link( $id, $atts['size'], true, false );
		}
		$image_meta  = wp_get_attachment_metadata( $id );

		$orientation = '';
		if ( isset( $image_meta['height'], $image_meta['width'] ) ) {
			$orientation = ( $image_meta['height'] > $image_meta['width'] ) ? 'portrait' : 'landscape';
		}
		$output .= "<{$itemtag} class='gallery-item'>";
		$output .= "
			<{$icontag} class='gallery-icon {$orientation}'>
				$image_output
			</{$icontag}>";
		if ( $captiontag && trim($attachment->post_excerpt) ) {
			$output .= "
				<{$captiontag} class='wp-caption-text gallery-caption'>
				" . wptexturize($attachment->post_excerpt) . "
				</{$captiontag}>";
		}
		$output .= "</{$itemtag}>";
		if ( ! $html5 && $columns > 0 && ++$i % $columns == 0 ) {
			$output .= '<br style="clear: both" />';
		}
	}

	if ( ! $html5 && $columns > 0 && $i % $columns !== 0 ) {
		$output .= "
			<br style='clear: both' />";
	}

	$output .= "
		</div>\n";

	return $output;
}

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/**

* The Gallery shortcode.

* This implements the functionality of the Gallery Shortcode for displaying

* WordPress images on a post.

* @since 2.5.0

* @param array $attr {

* Attributes of the gallery shortcode.

* @type string $order Order of the images in the gallery. Default 'ASC'. Accepts 'ASC', 'DESC'.

* @type string $orderby The field to use when ordering the images. Default 'menu_order ID'.

* Accepts any valid SQL ORDERBY statement.

* @type int $id Post ID.

* @type string $itemtag HTML tag to use for each image in the gallery.

* Default 'dl', or 'figure' when the theme registers HTML5 gallery support.

* @type string $icontag HTML tag to use for each image's icon.

* Default 'dt', or 'div' when the theme registers HTML5 gallery support.

* @type string $captiontag HTML tag to use for each image's caption.

* Default 'dd', or 'figcaption' when the theme registers HTML5 gallery support.

* @type int $columns Number of columns of images to display. Default 3.

* @type string $size Size of the images to display. Default 'thumbnail'.

* @type string $ids A comma-separated list of IDs of attachments to display. Default empty.

* @type string $include A comma-separated list of IDs of attachments to include. Default empty.

* @type string $exclude A comma-separated list of IDs of attachments to exclude. Default empty.

* @type string $link What to link each image to. Default empty (links to the attachment page).

* Accepts 'file', 'none'.

* }

* @return string HTML content to display gallery.

function gallery_shortcode( $attr ) {

$post = get_post();

static $instance = 0;

$instance++;

if ( ! empty( $attr['ids'] ) ) {

// 'ids' is explicitly ordered, unless you specify otherwise.

if ( empty( $attr['orderby'] ) ) {

$attr['orderby'] = 'post__in';

}

$attr['include'] = $attr['ids'];

}

/**

* Filter the default gallery shortcode output.

* If the filtered output isn't empty, it will be used instead of generating

* the default gallery template.

* @since 2.5.0

* @see gallery_shortcode()

* @param string $output The gallery output. Default empty.

* @param array $attr Attributes of the gallery shortcode.

$output = apply_filters( 'post_gallery', '', $attr );

if ( $output != '' ) {

return $output;

}

// We're trusting author input, so let's at least make sure it looks like a valid orderby statement

if ( isset( $attr['orderby'] ) ) {

$attr['orderby'] = sanitize_sql_orderby( $attr['orderby'] );

if ( ! $attr['orderby'] ) {

unset( $attr['orderby'] );

}

$html5 = current_theme_supports( 'html5', 'gallery' );

$atts = shortcode_atts( array(

'order' => 'ASC',

'orderby' => 'menu_order ID',

'id' => $post ? $post->ID : 0,

'itemtag' => $html5 ? 'figure' : 'dl',

'icontag' => $html5 ? 'div' : 'dt',

'captiontag' => $html5 ? 'figcaption' : 'dd',

'columns' => 3,

'size' => 'thumbnail',

'include' => '',

'exclude' => '',

'link' => ''

), $attr, 'gallery' );

$id = intval( $atts['id'] );

if ( 'RAND' == $atts['order'] ) {

$atts['orderby'] = 'none';

}

if ( ! empty( $atts['include'] ) ) {

$_attachments = get_posts( array( 'include' => $atts['include'], 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $atts['order'], 'orderby' => $atts['orderby'] ) );

$attachments = array();

foreach ( $_attachments as $key => $val ) {

$attachments[$val->ID] = $_attachments[$key];

}

} elseif ( ! empty( $atts['exclude'] ) ) {

$attachments = get_children( array( 'post_parent' => $id, 'exclude' => $atts['exclude'], 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $atts['order'], 'orderby' => $atts['orderby'] ) );

} else {

$attachments = get_children( array( 'post_parent' => $id, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $atts['order'], 'orderby' => $atts['orderby'] ) );

}

if ( empty( $attachments ) ) {

return '';

}

if ( is_feed() ) {

$output = "\n";

foreach ( $attachments as $att_id => $attachment ) {

$output .= wp_get_attachment_link( $att_id, $atts['size'], true ) . "\n";

}

return $output;

}

$itemtag = tag_escape( $atts['itemtag'] );

$captiontag = tag_escape( $atts['captiontag'] );

$icontag = tag_escape( $atts['icontag'] );

$valid_tags = wp_kses_allowed_html( 'post' );

if ( ! isset( $valid_tags[ $itemtag ] ) ) {

$itemtag = 'dl';

}

if ( ! isset( $valid_tags[ $captiontag ] ) ) {

$captiontag = 'dd';

}

if ( ! isset( $valid_tags[ $icontag ] ) ) {

$icontag = 'dt';

}

$columns = intval( $atts['columns'] );

$itemwidth = $columns > 0 ? floor(100/$columns) : 100;

$float = is_rtl() ? 'right' : 'left';

$selector = "gallery-{$instance}";

$gallery_style = '';

/**

* Filter whether to print default gallery styles.

* @since 3.1.0

* @param bool $print Whether to print default gallery styles.

* Defaults to false if the theme supports HTML5 galleries.

* Otherwise, defaults to true.

if ( apply_filters( 'use_default_gallery_style', ! $html5 ) ) {

$gallery_style = "

#{$selector} {

margin: auto;

}

#{$selector} .gallery-item {

float: {$float};

margin-top: 10px;

text-align: center;

width: {$itemwidth}%;

}

#{$selector} img {

border: 2px solid #cfcfcf;

}

#{$selector} .gallery-caption {

margin-left: 0;

}

/* see gallery_shortcode() in wp-includes/media.php */

</style>\n\t\t";

}

$size_class = sanitize_html_class( $atts['size'] );

$gallery_div = "<div id='$selector' class='gallery galleryid-{$id} gallery-columns-{$columns} gallery-size-{$size_class}'>";

/**

* Filter the default gallery shortcode CSS styles.

* @since 2.5.0

* @param string $gallery_style Default gallery shortcode CSS styles.

* @param string $gallery_div Opening HTML div container for the gallery shortcode output.

$output = apply_filters( 'gallery_style', $gallery_style . $gallery_div );

$i = 0;

foreach ( $attachments as $id => $attachment ) {

if ( ! empty( $atts['link'] ) && 'file' === $atts['link'] ) {

$image_output = wp_get_attachment_link( $id, $atts['size'], false, false );

} elseif ( ! empty( $atts['link'] ) && 'none' === $atts['link'] ) {

$image_output = wp_get_attachment_image( $id, $atts['size'], false );

} else {

$image_output = wp_get_attachment_link( $id, $atts['size'], true, false );

}

$image_meta = wp_get_attachment_metadata( $id );

$orientation = '';

if ( isset( $image_meta['height'], $image_meta['width'] ) ) {

$orientation = ( $image_meta['height'] > $image_meta['width'] ) ? 'portrait' : 'landscape';

}

$output .= "<{$itemtag} class='gallery-item'>";

$output .= "

<{$icontag} class='gallery-icon {$orientation}'>

$image_output

</{$icontag}>";

if ( $captiontag && trim($attachment->post_excerpt) ) {

$output .= "

<{$captiontag} class='wp-caption-text gallery-caption'>

" . wptexturize($attachment->post_excerpt) . "

</{$captiontag}>";

}

$output .= "</{$itemtag}>";

if ( ! $html5 && $columns > 0 && ++$i % $columns == 0 ) {

$output .= '<br style="clear: both" />';

}

if ( ! $html5 && $columns > 0 && $i % $columns !== 0 ) {

$output .= "

<br style='clear: both' />";

}

$output .= "

</div>\n";

return $output;

}

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WordPressを読む 65-2 /blog/wp-includes/media.php 2

/blog/wp-includes/media.php 2

WordPressを読む　65-2 /blog/wp-includes/media.php 2