WordPressを読む　38-11 /blog/wp-includes/post.php 11

2014/11/30 2014/12/25

1 /blog/wp-includes/post.php 11
2 関数　is_local_attachment()
3 関数　wp_insert_attachment()
4 関数　wp_delete_attachment()
5 関数　wp_get_attachment_metadata()
6 関数　wp_update_attachment_metadata()
7 関数　wp_get_attachment_url()
8 関数　wp_get_attachment_thumb_file()
9 関数　wp_get_attachment_thumb_url()
10 関数　wp_attachment_is_image()
11 関数　wp_mime_type_icon()

/blog/wp-includes/post.php 11

関数　is_local_attachment()

//
// Attachment functions
//

/**
 * Check if the attachment URI is local one and is really an attachment.
 *
 * @since 2.0.0
 *
 * @param string $url URL to check
 * @return bool True on success, false on failure.
 */
function is_local_attachment($url) {
	if (strpos($url, home_url()) === false)
		return false;
	if (strpos($url, home_url('/?attachment_id=')) !== false)
		return true;
	if ( $id = url_to_postid($url) ) {
		$post = get_post($id);
		if ( 'attachment' == $post->post_type )
			return true;
	}
	return false;
}

// Attachment functions

/**

* Check if the attachment URI is local one and is really an attachment.

* @since 2.0.0

* @param string $url URL to check

* @return bool True on success, false on failure.

function is_local_attachment($url) {

if (strpos($url, home_url()) === false)

return false;

if (strpos($url, home_url('/?attachment_id=')) !== false)

return true;

if ( $id = url_to_postid($url) ) {

$post = get_post($id);

if ( 'attachment' == $post->post_type )

return true;

}

return false;

}

関数　wp_insert_attachment()

/**
 * Insert an attachment.
 *
 * If you set the 'ID' in the $args parameter, it will mean that you are
 * updating and attempt to update the attachment. You can also set the
 * attachment name or title by setting the key 'post_name' or 'post_title'.
 *
 * You can set the dates for the attachment manually by setting the 'post_date'
 * and 'post_date_gmt' keys' values.
 *
 * By default, the comments will use the default settings for whether the
 * comments are allowed. You can close them manually or keep them open by
 * setting the value for the 'comment_status' key.
 *
 * @since 2.0.0
 *
 * @see wp_insert_post()
 *
 * @param string|array $args   Arguments for inserting an attachment.
 * @param string       $file   Optional. Filename.
 * @param int          $parent Optional. Parent post ID.
 * @return int Attachment ID.
 */
function wp_insert_attachment( $args, $file = false, $parent = 0 ) {
	$defaults = array(
		'file'        => $file,
		'post_parent' => $parent
	);
	$data = wp_parse_args( $args, $defaults );

	$data['post_type'] = 'attachment';

	return wp_insert_post( $data );
}

/**

* Insert an attachment.

* If you set the 'ID' in the $args parameter, it will mean that you are

* updating and attempt to update the attachment. You can also set the

* attachment name or title by setting the key 'post_name' or 'post_title'.

* You can set the dates for the attachment manually by setting the 'post_date'

* and 'post_date_gmt' keys' values.

* By default, the comments will use the default settings for whether the

* comments are allowed. You can close them manually or keep them open by

* setting the value for the 'comment_status' key.

* @since 2.0.0

* @see wp_insert_post()

* @param string|array $args Arguments for inserting an attachment.

* @param string $file Optional. Filename.

* @param int $parent Optional. Parent post ID.

* @return int Attachment ID.

function wp_insert_attachment( $args, $file = false, $parent = 0 ) {

$defaults = array(

'file' => $file,

'post_parent' => $parent

);

$data = wp_parse_args( $args, $defaults );

$data['post_type'] = 'attachment';

return wp_insert_post( $data );

}

関数　wp_delete_attachment()

/**
 * Trash or delete an attachment.
 *
 * When an attachment is permanently deleted, the file will also be removed.
 * Deletion removes all post meta fields, taxonomy, comments, etc. associated
 * with the attachment (except the main post).
 *
 * The attachment is moved to the trash instead of permanently deleted unless trash
 * for media is disabled, item is already in the trash, or $force_delete is true.
 *
 * @since 2.0.0
 *
 * @global wpdb $wpdb WordPress database access abstraction object.
 *
 * @param int  $post_id      Attachment ID.
 * @param bool $force_delete Optional. Whether to bypass trash and force deletion.
 *                           Default false.
 * @return mixed False on failure. Post data on success.
 */
function wp_delete_attachment( $post_id, $force_delete = false ) {
	global $wpdb;

	if ( !$post = $wpdb->get_row( $wpdb->prepare("SELECT * FROM $wpdb->posts WHERE ID = %d", $post_id) ) )
		return $post;

	if ( 'attachment' != $post->post_type )
		return false;

	if ( !$force_delete && EMPTY_TRASH_DAYS && MEDIA_TRASH && 'trash' != $post->post_status )
		return wp_trash_post( $post_id );

	delete_post_meta($post_id, '_wp_trash_meta_status');
	delete_post_meta($post_id, '_wp_trash_meta_time');

	$meta = wp_get_attachment_metadata( $post_id );
	$backup_sizes = get_post_meta( $post->ID, '_wp_attachment_backup_sizes', true );
	$file = get_attached_file( $post_id );

	$intermediate_sizes = array();
	foreach ( get_intermediate_image_sizes() as $size ) {
		if ( $intermediate = image_get_intermediate_size( $post_id, $size ) )
			$intermediate_sizes[] = $intermediate;
	}

	if ( is_multisite() )
		delete_transient( 'dirsize_cache' );

	/**
	 * Fires before an attachment is deleted, at the start of wp_delete_attachment().
	 *
	 * @since 2.0.0
	 *
	 * @param int $post_id Attachment ID.
	 */
	do_action( 'delete_attachment', $post_id );

	wp_delete_object_term_relationships($post_id, array('category', 'post_tag'));
	wp_delete_object_term_relationships($post_id, get_object_taxonomies($post->post_type));

	// Delete all for any posts.
	delete_metadata( 'post', null, '_thumbnail_id', $post_id, true );

	$comment_ids = $wpdb->get_col( $wpdb->prepare( "SELECT comment_ID FROM $wpdb->comments WHERE comment_post_ID = %d", $post_id ));
	foreach ( $comment_ids as $comment_id )
		wp_delete_comment( $comment_id, true );

	$post_meta_ids = $wpdb->get_col( $wpdb->prepare( "SELECT meta_id FROM $wpdb->postmeta WHERE post_id = %d ", $post_id ));
	foreach ( $post_meta_ids as $mid )
		delete_metadata_by_mid( 'post', $mid );

	/** This action is documented in wp-includes/post.php */
	do_action( 'delete_post', $post_id );
	$result = $wpdb->delete( $wpdb->posts, array( 'ID' => $post_id ) );
	if ( ! $result ) {
		return false;
	}
	/** This action is documented in wp-includes/post.php */
	do_action( 'deleted_post', $post_id );

	$uploadpath = wp_upload_dir();

	if ( ! empty($meta['thumb']) ) {
		// Don't delete the thumb if another attachment uses it.
		if (! $wpdb->get_row( $wpdb->prepare( "SELECT meta_id FROM $wpdb->postmeta WHERE meta_key = '_wp_attachment_metadata' AND meta_value LIKE %s AND post_id <> %d", '%' . $wpdb->esc_like( $meta['thumb'] ) . '%', $post_id)) ) {
			$thumbfile = str_replace(basename($file), $meta['thumb'], $file);
			/** This filter is documented in wp-admin/custom-header.php */
			$thumbfile = apply_filters( 'wp_delete_file', $thumbfile );
			@ unlink( path_join($uploadpath['basedir'], $thumbfile) );
		}
	}

	// Remove intermediate and backup images if there are any.
	foreach ( $intermediate_sizes as $intermediate ) {
		/** This filter is documented in wp-admin/custom-header.php */
		$intermediate_file = apply_filters( 'wp_delete_file', $intermediate['path'] );
		@ unlink( path_join($uploadpath['basedir'], $intermediate_file) );
	}

	if ( is_array($backup_sizes) ) {
		foreach ( $backup_sizes as $size ) {
			$del_file = path_join( dirname($meta['file']), $size['file'] );
			/** This filter is documented in wp-admin/custom-header.php */
			$del_file = apply_filters( 'wp_delete_file', $del_file );
			@ unlink( path_join($uploadpath['basedir'], $del_file) );
		}
	}

	/** This filter is documented in wp-admin/custom-header.php */
	$file = apply_filters( 'wp_delete_file', $file );

	if ( ! empty($file) )
		@ unlink($file);

	clean_post_cache( $post );

	return $post;
}

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/**

* Trash or delete an attachment.

* When an attachment is permanently deleted, the file will also be removed.

* Deletion removes all post meta fields, taxonomy, comments, etc. associated

* with the attachment (except the main post).

* The attachment is moved to the trash instead of permanently deleted unless trash

* for media is disabled, item is already in the trash, or $force_delete is true.

* @since 2.0.0

* @global wpdb $wpdb WordPress database access abstraction object.

* @param int $post_id Attachment ID.

* @param bool $force_delete Optional. Whether to bypass trash and force deletion.

* Default false.

* @return mixed False on failure. Post data on success.

function wp_delete_attachment( $post_id, $force_delete = false ) {

global $wpdb;

if ( !$post = $wpdb->get_row( $wpdb->prepare("SELECT * FROM $wpdb->posts WHERE ID = %d", $post_id) ) )

return $post;

if ( 'attachment' != $post->post_type )

return false;

if ( !$force_delete && EMPTY_TRASH_DAYS && MEDIA_TRASH && 'trash' != $post->post_status )

return wp_trash_post( $post_id );

delete_post_meta($post_id, '_wp_trash_meta_status');

delete_post_meta($post_id, '_wp_trash_meta_time');

$meta = wp_get_attachment_metadata( $post_id );

$backup_sizes = get_post_meta( $post->ID, '_wp_attachment_backup_sizes', true );

$file = get_attached_file( $post_id );

$intermediate_sizes = array();

foreach ( get_intermediate_image_sizes() as $size ) {

if ( $intermediate = image_get_intermediate_size( $post_id, $size ) )

$intermediate_sizes[] = $intermediate;

}

if ( is_multisite() )

delete_transient( 'dirsize_cache' );

/**

* Fires before an attachment is deleted, at the start of wp_delete_attachment().

* @since 2.0.0

* @param int $post_id Attachment ID.

do_action( 'delete_attachment', $post_id );

wp_delete_object_term_relationships($post_id, array('category', 'post_tag'));

wp_delete_object_term_relationships($post_id, get_object_taxonomies($post->post_type));

// Delete all for any posts.

delete_metadata( 'post', null, '_thumbnail_id', $post_id, true );

$comment_ids = $wpdb->get_col( $wpdb->prepare( "SELECT comment_ID FROM $wpdb->comments WHERE comment_post_ID = %d", $post_id ));

foreach ( $comment_ids as $comment_id )

wp_delete_comment( $comment_id, true );

$post_meta_ids = $wpdb->get_col( $wpdb->prepare( "SELECT meta_id FROM $wpdb->postmeta WHERE post_id = %d ", $post_id ));

foreach ( $post_meta_ids as $mid )

delete_metadata_by_mid( 'post', $mid );

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

do_action( 'delete_post', $post_id );

$result = $wpdb->delete( $wpdb->posts, array( 'ID' => $post_id ) );

if ( ! $result ) {

return false;

}

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

do_action( 'deleted_post', $post_id );

$uploadpath = wp_upload_dir();

if ( ! empty($meta['thumb']) ) {

// Don't delete the thumb if another attachment uses it.

if (! $wpdb->get_row( $wpdb->prepare( "SELECT meta_id FROM $wpdb->postmeta WHERE meta_key = '_wp_attachment_metadata' AND meta_value LIKE %s AND post_id <> %d", '%' . $wpdb->esc_like( $meta['thumb'] ) . '%', $post_id)) ) {

$thumbfile = str_replace(basename($file), $meta['thumb'], $file);

/** This filter is documented in wp-admin/custom-header.php */

$thumbfile = apply_filters( 'wp_delete_file', $thumbfile );

@ unlink( path_join($uploadpath['basedir'], $thumbfile) );

}

// Remove intermediate and backup images if there are any.

foreach ( $intermediate_sizes as $intermediate ) {

/** This filter is documented in wp-admin/custom-header.php */

$intermediate_file = apply_filters( 'wp_delete_file', $intermediate['path'] );

@ unlink( path_join($uploadpath['basedir'], $intermediate_file) );

}

if ( is_array($backup_sizes) ) {

foreach ( $backup_sizes as $size ) {

$del_file = path_join( dirname($meta['file']), $size['file'] );

/** This filter is documented in wp-admin/custom-header.php */

$del_file = apply_filters( 'wp_delete_file', $del_file );

@ unlink( path_join($uploadpath['basedir'], $del_file) );

}

/** This filter is documented in wp-admin/custom-header.php */

$file = apply_filters( 'wp_delete_file', $file );

if ( ! empty($file) )

@ unlink($file);

clean_post_cache( $post );

return $post;

}

関数　wp_get_attachment_metadata()

/**
 * Retrieve attachment meta field for attachment ID.
 *
 * @since 2.1.0
 *
 * @param int  $post_id    Attachment ID. Default 0.
 * @param bool $unfiltered Optional. If true, filters are not run. Default false.
 * @return string|bool Attachment meta field. False on failure.
 */
function wp_get_attachment_metadata( $post_id = 0, $unfiltered = false ) {
	$post_id = (int) $post_id;
	if ( !$post = get_post( $post_id ) )
		return false;

	$data = get_post_meta( $post->ID, '_wp_attachment_metadata', true );

	if ( $unfiltered )
		return $data;

	/**
	 * Filter the attachment meta data.
	 *
	 * @since 2.1.0
	 *
	 * @param array|bool $data    Array of meta data for the given attachment, or false
	 *                            if the object does not exist.
	 * @param int        $post_id Attachment ID.
	 */
	return apply_filters( 'wp_get_attachment_metadata', $data, $post->ID );
}

/**

* Retrieve attachment meta field for attachment ID.

* @since 2.1.0

* @param int $post_id Attachment ID. Default 0.

* @param bool $unfiltered Optional. If true, filters are not run. Default false.

* @return string|bool Attachment meta field. False on failure.

function wp_get_attachment_metadata( $post_id = 0, $unfiltered = false ) {

$post_id = (int) $post_id;

if ( !$post = get_post( $post_id ) )

return false;

$data = get_post_meta( $post->ID, '_wp_attachment_metadata', true );

if ( $unfiltered )

return $data;

/**

* Filter the attachment meta data.

* @since 2.1.0

* @param array|bool $data Array of meta data for the given attachment, or false

* if the object does not exist.

* @param int $post_id Attachment ID.

return apply_filters( 'wp_get_attachment_metadata', $data, $post->ID );

}

関数　wp_update_attachment_metadata()

/**
 * Update metadata for an attachment.
 *
 * @since 2.1.0
 *
 * @param int   $post_id Attachment ID.
 * @param array $data    Attachment data.
 * @return int|bool False if $post is invalid.
 */
function wp_update_attachment_metadata( $post_id, $data ) {
	$post_id = (int) $post_id;
	if ( !$post = get_post( $post_id ) )
		return false;

	/**
	 * Filter the updated attachment meta data.
	 *
	 * @since 2.1.0
	 *
	 * @param array $data    Array of updated attachment meta data.
	 * @param int   $post_id Attachment ID.
	 */
	if ( $data = apply_filters( 'wp_update_attachment_metadata', $data, $post->ID ) )
		return update_post_meta( $post->ID, '_wp_attachment_metadata', $data );
	else
		return delete_post_meta( $post->ID, '_wp_attachment_metadata' );
}

/**

* Update metadata for an attachment.

* @since 2.1.0

* @param int $post_id Attachment ID.

* @param array $data Attachment data.

* @return int|bool False if $post is invalid.

function wp_update_attachment_metadata( $post_id, $data ) {

$post_id = (int) $post_id;

if ( !$post = get_post( $post_id ) )

return false;

/**

* Filter the updated attachment meta data.

* @since 2.1.0

* @param array $data Array of updated attachment meta data.

* @param int $post_id Attachment ID.

if ( $data = apply_filters( 'wp_update_attachment_metadata', $data, $post->ID ) )

return update_post_meta( $post->ID, '_wp_attachment_metadata', $data );

else

return delete_post_meta( $post->ID, '_wp_attachment_metadata' );

}

関数　wp_get_attachment_url()

/**
 * Retrieve the URL for an attachment.
 *
 * @since 2.1.0
 *
 * @param int $post_id Optional. Attachment ID. Default 0.
 * @return string|bool Attachment URL, otherwise false.
 */
function wp_get_attachment_url( $post_id = 0 ) {
	$post_id = (int) $post_id;
	if ( !$post = get_post( $post_id ) )
		return false;

	if ( 'attachment' != $post->post_type )
		return false;

	$url = '';
	// Get attached file.
	if ( $file = get_post_meta( $post->ID, '_wp_attached_file', true) ) {
		// Get upload directory.
		if ( ($uploads = wp_upload_dir()) && false === $uploads['error'] ) {
			// Check that the upload base exists in the file location.
			if ( 0 === strpos( $file, $uploads['basedir'] ) ) {
				// Replace file location with url location.
				$url = str_replace($uploads['basedir'], $uploads['baseurl'], $file);
			} elseif ( false !== strpos($file, 'wp-content/uploads') ) {
				$url = $uploads['baseurl'] . substr( $file, strpos($file, 'wp-content/uploads') + 18 );
			} else {
				// It's a newly-uploaded file, therefore $file is relative to the basedir.
				$url = $uploads['baseurl'] . "/$file";
			}
		}
	}

	/*
	 * If any of the above options failed, Fallback on the GUID as used pre-2.7,
	 * not recommended to rely upon this.
	 */
	if ( empty($url) ) {
		$url = get_the_guid( $post->ID );
	}

	/**
	 * Filter the attachment URL.
	 *
	 * @since 2.1.0
	 *
	 * @param string $url     URL for the given attachment.
	 * @param int    $post_id Attachment ID.
	 */
	$url = apply_filters( 'wp_get_attachment_url', $url, $post->ID );

	if ( empty( $url ) )
		return false;

	return $url;
}

/**

* Retrieve the URL for an attachment.

* @since 2.1.0

* @param int $post_id Optional. Attachment ID. Default 0.

* @return string|bool Attachment URL, otherwise false.

function wp_get_attachment_url( $post_id = 0 ) {

$post_id = (int) $post_id;

if ( !$post = get_post( $post_id ) )

return false;

if ( 'attachment' != $post->post_type )

return false;

$url = '';

// Get attached file.

if ( $file = get_post_meta( $post->ID, '_wp_attached_file', true) ) {

// Get upload directory.

if ( ($uploads = wp_upload_dir()) && false === $uploads['error'] ) {

// Check that the upload base exists in the file location.

if ( 0 === strpos( $file, $uploads['basedir'] ) ) {

// Replace file location with url location.

$url = str_replace($uploads['basedir'], $uploads['baseurl'], $file);

} elseif ( false !== strpos($file, 'wp-content/uploads') ) {

$url = $uploads['baseurl'] . substr( $file, strpos($file, 'wp-content/uploads') + 18 );

} else {

// It's a newly-uploaded file, therefore $file is relative to the basedir.

$url = $uploads['baseurl'] . "/$file";

}

* If any of the above options failed, Fallback on the GUID as used pre-2.7,

* not recommended to rely upon this.

if ( empty($url) ) {

$url = get_the_guid( $post->ID );

}

/**

* Filter the attachment URL.

* @since 2.1.0

* @param string $url URL for the given attachment.

* @param int $post_id Attachment ID.

$url = apply_filters( 'wp_get_attachment_url', $url, $post->ID );

if ( empty( $url ) )

return false;

return $url;

}

関数　wp_get_attachment_thumb_file()

/**
 * Retrieve thumbnail for an attachment.
 *
 * @since 2.1.0
 *
 * @param int $post_id Optional. Attachment ID. Default 0.
 * @return mixed False on failure. Thumbnail file path on success.
 */
function wp_get_attachment_thumb_file( $post_id = 0 ) {
	$post_id = (int) $post_id;
	if ( !$post = get_post( $post_id ) )
		return false;
	if ( !is_array( $imagedata = wp_get_attachment_metadata( $post->ID ) ) )
		return false;

	$file = get_attached_file( $post->ID );

	if ( !empty($imagedata['thumb']) && ($thumbfile = str_replace(basename($file), $imagedata['thumb'], $file)) && file_exists($thumbfile) ) {
		/**
		 * Filter the attachment thumbnail file path.
		 *
		 * @since 2.1.0
		 *
		 * @param string $thumbfile File path to the attachment thumbnail.
		 * @param int    $post_id   Attachment ID.
		 */
		return apply_filters( 'wp_get_attachment_thumb_file', $thumbfile, $post->ID );
	}
	return false;
}

/**

* Retrieve thumbnail for an attachment.

* @since 2.1.0

* @param int $post_id Optional. Attachment ID. Default 0.

* @return mixed False on failure. Thumbnail file path on success.

function wp_get_attachment_thumb_file( $post_id = 0 ) {

$post_id = (int) $post_id;

if ( !$post = get_post( $post_id ) )

return false;

if ( !is_array( $imagedata = wp_get_attachment_metadata( $post->ID ) ) )

return false;

$file = get_attached_file( $post->ID );

if ( !empty($imagedata['thumb']) && ($thumbfile = str_replace(basename($file), $imagedata['thumb'], $file)) && file_exists($thumbfile) ) {

/**

* Filter the attachment thumbnail file path.

* @since 2.1.0

* @param string $thumbfile File path to the attachment thumbnail.

* @param int $post_id Attachment ID.

return apply_filters( 'wp_get_attachment_thumb_file', $thumbfile, $post->ID );

}

return false;

}

関数　wp_get_attachment_thumb_url()

/**
 * Retrieve URL for an attachment thumbnail.
 *
 * @since 2.1.0
 *
 * @param int $post_id Optional. Attachment ID. Default 0.
 * @return string|bool False on failure. Thumbnail URL on success.
 */
function wp_get_attachment_thumb_url( $post_id = 0 ) {
	$post_id = (int) $post_id;
	if ( !$post = get_post( $post_id ) )
		return false;
	if ( !$url = wp_get_attachment_url( $post->ID ) )
		return false;

	$sized = image_downsize( $post_id, 'thumbnail' );
	if ( $sized )
		return $sized[0];

	if ( !$thumb = wp_get_attachment_thumb_file( $post->ID ) )
		return false;

	$url = str_replace(basename($url), basename($thumb), $url);

	/**
	 * Filter the attachment thumbnail URL.
	 *
	 * @since 2.1.0
	 *
	 * @param string $url     URL for the attachment thumbnail.
	 * @param int    $post_id Attachment ID.
	 */
	return apply_filters( 'wp_get_attachment_thumb_url', $url, $post->ID );
}

/**

* Retrieve URL for an attachment thumbnail.

* @since 2.1.0

* @param int $post_id Optional. Attachment ID. Default 0.

* @return string|bool False on failure. Thumbnail URL on success.

function wp_get_attachment_thumb_url( $post_id = 0 ) {

$post_id = (int) $post_id;

if ( !$post = get_post( $post_id ) )

return false;

if ( !$url = wp_get_attachment_url( $post->ID ) )

return false;

$sized = image_downsize( $post_id, 'thumbnail' );

if ( $sized )

return $sized[0];

if ( !$thumb = wp_get_attachment_thumb_file( $post->ID ) )

return false;

$url = str_replace(basename($url), basename($thumb), $url);

/**

* Filter the attachment thumbnail URL.

* @since 2.1.0

* @param string $url URL for the attachment thumbnail.

* @param int $post_id Attachment ID.

return apply_filters( 'wp_get_attachment_thumb_url', $url, $post->ID );

}

関数　wp_attachment_is_image()

/**
 * Check if the attachment is an image.
 *
 * @since 2.1.0
 *
 * @param int $post_id Optional. Attachment ID. Default 0.
 * @return bool Whether the attachment is an image.
 */
function wp_attachment_is_image( $post_id = 0 ) {
	$post_id = (int) $post_id;
	if ( !$post = get_post( $post_id ) )
		return false;

	if ( !$file = get_attached_file( $post->ID ) )
		return false;

	$ext = preg_match('/\.([^.]+)$/', $file, $matches) ? strtolower($matches[1]) : false;

	$image_exts = array( 'jpg', 'jpeg', 'jpe', 'gif', 'png' );

	if ( 'image/' == substr($post->post_mime_type, 0, 6) || $ext && 'import' == $post->post_mime_type && in_array($ext, $image_exts) )
		return true;
	return false;
}

/**

* Check if the attachment is an image.

* @since 2.1.0

* @param int $post_id Optional. Attachment ID. Default 0.

* @return bool Whether the attachment is an image.

function wp_attachment_is_image( $post_id = 0 ) {

$post_id = (int) $post_id;

if ( !$post = get_post( $post_id ) )

return false;

if ( !$file = get_attached_file( $post->ID ) )

return false;

$ext = preg_match('/\.([^.]+)$/', $file, $matches) ? strtolower($matches[1]) : false;

$image_exts = array( 'jpg', 'jpeg', 'jpe', 'gif', 'png' );

if ( 'image/' == substr($post->post_mime_type, 0, 6) || $ext && 'import' == $post->post_mime_type && in_array($ext, $image_exts) )

return true;

return false;

}

関数　wp_mime_type_icon()

/**
 * Retrieve the icon for a MIME type.
 *
 * @since 2.1.0
 *
 * @param string|int $mime MIME type or attachment ID.
 * @return string|bool Icon, false otherwise.
 */
function wp_mime_type_icon( $mime = 0 ) {
	if ( !is_numeric($mime) )
		$icon = wp_cache_get("mime_type_icon_$mime");

	$post_id = 0;
	if ( empty($icon) ) {
		$post_mimes = array();
		if ( is_numeric($mime) ) {
			$mime = (int) $mime;
			if ( $post = get_post( $mime ) ) {
				$post_id = (int) $post->ID;
				$ext = preg_replace('/^.+?\.([^.]+)$/', '$1', $post->guid);
				if ( !empty($ext) ) {
					$post_mimes[] = $ext;
					if ( $ext_type = wp_ext2type( $ext ) )
						$post_mimes[] = $ext_type;
				}
				$mime = $post->post_mime_type;
			} else {
				$mime = 0;
			}
		} else {
			$post_mimes[] = $mime;
		}

		$icon_files = wp_cache_get('icon_files');

		if ( !is_array($icon_files) ) {
			/**
			 * Filter the icon directory path.
			 *
			 * @since 2.0.0
			 *
			 * @param string $path Icon directory absolute path.
			 */
			$icon_dir = apply_filters( 'icon_dir', ABSPATH . WPINC . '/images/media' );

			/**
			 * Filter the icon directory URI.
			 *
			 * @since 2.0.0
			 *
			 * @param string $uri Icon directory URI.
			 */
			$icon_dir_uri = apply_filters( 'icon_dir_uri', includes_url( 'images/media' ) );

			/**
			 * Filter the list of icon directory URIs.
			 *
			 * @since 2.5.0
			 *
			 * @param array $uris List of icon directory URIs.
			 */
			$dirs = apply_filters( 'icon_dirs', array( $icon_dir => $icon_dir_uri ) );
			$icon_files = array();
			while ( $dirs ) {
				$keys = array_keys( $dirs );
				$dir = array_shift( $keys );
				$uri = array_shift($dirs);
				if ( $dh = opendir($dir) ) {
					while ( false !== $file = readdir($dh) ) {
						$file = basename($file);
						if ( substr($file, 0, 1) == '.' )
							continue;
						if ( !in_array(strtolower(substr($file, -4)), array('.png', '.gif', '.jpg') ) ) {
							if ( is_dir("$dir/$file") )
								$dirs["$dir/$file"] = "$uri/$file";
							continue;
						}
						$icon_files["$dir/$file"] = "$uri/$file";
					}
					closedir($dh);
				}
			}
			wp_cache_add( 'icon_files', $icon_files, 'default', 600 );
		}

		// Icon basename - extension = MIME wildcard.
		foreach ( $icon_files as $file => $uri )
			$types[ preg_replace('/^([^.]*).*$/', '$1', basename($file)) ] =& $icon_files[$file];

		if ( ! empty($mime) ) {
			$post_mimes[] = substr($mime, 0, strpos($mime, '/'));
			$post_mimes[] = substr($mime, strpos($mime, '/') + 1);
			$post_mimes[] = str_replace('/', '_', $mime);
		}

		$matches = wp_match_mime_types(array_keys($types), $post_mimes);
		$matches['default'] = array('default');

		foreach ( $matches as $match => $wilds ) {
			if ( isset($types[$wilds[0]])) {
				$icon = $types[$wilds[0]];
				if ( !is_numeric($mime) )
					wp_cache_add("mime_type_icon_$mime", $icon);
				break;
			}
		}
	}

	/**
	 * Filter the mime type icon.
	 *
	 * @since 2.1.0
	 *
	 * @param string $icon    Path to the mime type icon.
	 * @param string $mime    Mime type.
	 * @param int    $post_id Attachment ID. Will equal 0 if the function passed
	 *                        the mime type.
	 */
	return apply_filters( 'wp_mime_type_icon', $icon, $mime, $post_id );
}

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/**

* Retrieve the icon for a MIME type.

* @since 2.1.0

* @param string|int $mime MIME type or attachment ID.

* @return string|bool Icon, false otherwise.

function wp_mime_type_icon( $mime = 0 ) {

if ( !is_numeric($mime) )

$icon = wp_cache_get("mime_type_icon_$mime");

$post_id = 0;

if ( empty($icon) ) {

$post_mimes = array();

if ( is_numeric($mime) ) {

$mime = (int) $mime;

if ( $post = get_post( $mime ) ) {

$post_id = (int) $post->ID;

$ext = preg_replace('/^.+?\.([^.]+)$/', '$1', $post->guid);

if ( !empty($ext) ) {

$post_mimes[] = $ext;

if ( $ext_type = wp_ext2type( $ext ) )

$post_mimes[] = $ext_type;

}

$mime = $post->post_mime_type;

} else {

$mime = 0;

}

} else {

$post_mimes[] = $mime;

}

$icon_files = wp_cache_get('icon_files');

if ( !is_array($icon_files) ) {

/**

* Filter the icon directory path.

* @since 2.0.0

* @param string $path Icon directory absolute path.

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

/**

* Filter the icon directory URI.

* @since 2.0.0

* @param string $uri Icon directory URI.

$icon_dir_uri = apply_filters( 'icon_dir_uri', includes_url( 'images/media' ) );

/**

* Filter the list of icon directory URIs.

* @since 2.5.0

* @param array $uris List of icon directory URIs.

$dirs = apply_filters( 'icon_dirs', array( $icon_dir => $icon_dir_uri ) );

$icon_files = array();

while ( $dirs ) {

$keys = array_keys( $dirs );

$dir = array_shift( $keys );

$uri = array_shift($dirs);

if ( $dh = opendir($dir) ) {

while ( false !== $file = readdir($dh) ) {

$file = basename($file);

if ( substr($file, 0, 1) == '.' )

continue;

if ( !in_array(strtolower(substr($file, -4)), array('.png', '.gif', '.jpg') ) ) {

if ( is_dir("$dir/$file") )

$dirs["$dir/$file"] = "$uri/$file";

continue;

}

$icon_files["$dir/$file"] = "$uri/$file";

}

closedir($dh);

}

wp_cache_add( 'icon_files', $icon_files, 'default', 600 );

}

// Icon basename - extension = MIME wildcard.

foreach ( $icon_files as $file => $uri )

$types[ preg_replace('/^([^.]*).*$/', '$1', basename($file)) ] =& $icon_files[$file];

if ( ! empty($mime) ) {

$post_mimes[] = substr($mime, 0, strpos($mime, '/'));

$post_mimes[] = substr($mime, strpos($mime, '/') + 1);

$post_mimes[] = str_replace('/', '_', $mime);

}

$matches = wp_match_mime_types(array_keys($types), $post_mimes);

$matches['default'] = array('default');

foreach ( $matches as $match => $wilds ) {

if ( isset($types[$wilds[0]])) {

$icon = $types[$wilds[0]];

if ( !is_numeric($mime) )

wp_cache_add("mime_type_icon_$mime", $icon);

break;

}

/**

* Filter the mime type icon.

* @since 2.1.0

* @param string $icon Path to the mime type icon.

* @param string $mime Mime type.

* @param int $post_id Attachment ID. Will equal 0 if the function passed

* the mime type.

return apply_filters( 'wp_mime_type_icon', $icon, $mime, $post_id );

}

- Wordpress

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WordPressを読む　38-11 /blog/wp-includes/post.php 11