WordPressを読む　60-4 /blog/wp-includes/taxonomy.php 4

2014/12/04 2015/02/25

1 /blog/wp-includes/taxonomy.php 4
2 関数　get_terms()

/blog/wp-includes/taxonomy.php 4

関数　get_terms()

/**
 * Retrieve the terms in a given taxonomy or list of taxonomies.
 *
 * You can fully inject any customizations to the query before it is sent, as
 * well as control the output with a filter.
 *
 * The 'get_terms' filter will be called when the cache has the term and will
 * pass the found term along with the array of $taxonomies and array of $args.
 * This filter is also called before the array of terms is passed and will pass
 * the array of terms, along with the $taxonomies and $args.
 *
 * The 'list_terms_exclusions' filter passes the compiled exclusions along with
 * the $args.
 *
 * The 'get_terms_orderby' filter passes the ORDER BY clause for the query
 * along with the $args array.
 *
 * The 'get_terms_fields' filter passes the fields for the SELECT query
 * along with the $args array.
 *
 * @since 2.3.0
 *
 * @global wpdb $wpdb WordPress database access abstraction object.
 *
 * @param string|array $taxonomies Taxonomy name or list of Taxonomy names.
 * @param array|string $args {
 *     Optional. Array or string of arguments to get terms.
 *
 *     @type string   $orderby               Field(s) to order terms by. Accepts term fields, though
 *                                           empty defaults to 'term_id'. Default 'name'.
 *     @type string   $order                 Whether to order terms in ascending or descending order.
 *                                           Accepts 'ASC' (ascending) or 'DESC' (descending).
 *                                           Default 'ASC'.
 *     @type bool|int     $hide_empty        Whether to hide terms not assigned to any posts. Accepts
 *                                           1|true or 0|false. Default 1|true.
 *     @type array|string $include           Array or comma/space-separated string of term ids to include.
 *                                           Default empty array.
 *     @type array|string $exclude           Array or comma/space-separated string of term ids to exclude.
 *                                           If $include is non-empty, $exclude is ignored.
 *                                           Default empty array.
 *     @type array|string $exclude_tree      Array or comma/space-separated string of term ids to exclude
 *                                           along with all of their descendant terms. If $include is
 *                                           non-empty, $exclude_tree is ignored. Default empty array.
 *     @type int          $number            Maximum number of terms to return. Accepts 1+ or -1 (all).
 *                                           Default -1.
 *     @type int          $offset            The number by which to offset the terms query. Default empty.
 *     @type string       $fields            Term fields to query for. Accepts 'all' (returns an array of
 *                                           term objects), 'ids' or 'names' (returns an array of integers
 *                                           or strings, respectively. Default 'all'.
 *     @type string       $slug              Slug to return term(s) for. Default empty.
 *     @type bool         $hierarchical      Whether to include terms that have non-empty descendants (even
 *                                           if $hide_empty is set to true). Default true.
 *     @type string       $search            Search criteria to match terms. Will be SQL-formatted with
 *                                           wildcards before and after. Default empty.
 *     @type string       $name__like        Retrieve terms with criteria by which a term is LIKE $name__like.
 *                                           Default empty.
 *     @type string       $description__like Retrieve terms where the description is LIKE $description__like.
 *                                           Default empty.
 *     @type bool         $pad_counts        Whether to pad the quantity of a term's children in the quantity
 *                                           of each term's "count" object variable. Default false.
 *     @type string       $get               Whether to return terms regardless of ancestry or whether the terms
 *                                           are empty. Accepts 'all' or empty (disabled). Default empty.
 *     @type int          $child_of          Term ID to retrieve child terms of. If multiple taxonomies
 *                                           are passed, $child_of is ignored. Default 0.
 *     @type int|string   $parent            Parent term ID to retrieve direct-child terms of. Default empty.
 *     @type string       $cache_domain      Unique cache key to be produced when this query is stored in an
 *                                           object cache. Default is 'core'.
 * }
 * @return array|WP_Error List of Term Objects and their children. Will return WP_Error, if any of $taxonomies
 *                        do not exist.
 */
function get_terms( $taxonomies, $args = '' ) {
	global $wpdb;
	$empty_array = array();

	$single_taxonomy = ! is_array( $taxonomies ) || 1 === count( $taxonomies );
	if ( ! is_array( $taxonomies ) ) {
		$taxonomies = array( $taxonomies );
	}

	foreach ( $taxonomies as $taxonomy ) {
		if ( ! taxonomy_exists($taxonomy) ) {
			$error = new WP_Error('invalid_taxonomy', __('Invalid taxonomy'));
			return $error;
		}
	}

	$defaults = array('orderby' => 'name', 'order' => 'ASC',
		'hide_empty' => true, 'exclude' => array(), 'exclude_tree' => array(), 'include' => array(),
		'number' => '', 'fields' => 'all', 'slug' => '', 'parent' => '',
		'hierarchical' => true, 'child_of' => 0, 'get' => '', 'name__like' => '', 'description__like' => '',
		'pad_counts' => false, 'offset' => '', 'search' => '', 'cache_domain' => 'core' );
	$args = wp_parse_args( $args, $defaults );
	$args['number'] = absint( $args['number'] );
	$args['offset'] = absint( $args['offset'] );
	if ( !$single_taxonomy || ! is_taxonomy_hierarchical( reset( $taxonomies ) ) ||
		( '' !== $args['parent'] && 0 !== $args['parent'] ) ) {
		$args['child_of'] = 0;
		$args['hierarchical'] = false;
		$args['pad_counts'] = false;
	}

	if ( 'all' == $args['get'] ) {
		$args['child_of'] = 0;
		$args['hide_empty'] = 0;
		$args['hierarchical'] = false;
		$args['pad_counts'] = false;
	}

	/**
	 * Filter the terms query arguments.
	 *
	 * @since 3.1.0
	 *
	 * @param array        $args       An array of arguments.
	 * @param string|array $taxonomies A taxonomy or array of taxonomies.
	 */
	$args = apply_filters( 'get_terms_args', $args, $taxonomies );

	$child_of = $args['child_of'];
	if ( $child_of ) {
		$hierarchy = _get_term_hierarchy( reset( $taxonomies ) );
		if ( ! isset( $hierarchy[ $child_of ] ) ) {
			return $empty_array;
		}
	}

	$parent = $args['parent'];
	if ( $parent ) {
		$hierarchy = _get_term_hierarchy( reset( $taxonomies ) );
		if ( ! isset( $hierarchy[ $parent ] ) ) {
			return $empty_array;
		}
	}

	// $args can be whatever, only use the args defined in defaults to compute the key
	$filter_key = ( has_filter('list_terms_exclusions') ) ? serialize($GLOBALS['wp_filter']['list_terms_exclusions']) : '';
	$key = md5( serialize( wp_array_slice_assoc( $args, array_keys( $defaults ) ) ) . serialize( $taxonomies ) . $filter_key );
	$last_changed = wp_cache_get( 'last_changed', 'terms' );
	if ( ! $last_changed ) {
		$last_changed = microtime();
		wp_cache_set( 'last_changed', $last_changed, 'terms' );
	}
	$cache_key = "get_terms:$key:$last_changed";
	$cache = wp_cache_get( $cache_key, 'terms' );
	if ( false !== $cache ) {

		/**
		 * Filter the given taxonomy's terms cache.
		 *
		 * @since 2.3.0
		 *
		 * @param array        $cache      Cached array of terms for the given taxonomy.
		 * @param string|array $taxonomies A taxonomy or array of taxonomies.
		 * @param array        $args       An array of arguments to get terms.
		 */
		$cache = apply_filters( 'get_terms', $cache, $taxonomies, $args );
		return $cache;
	}

	$_orderby = strtolower( $args['orderby'] );
	if ( 'count' == $_orderby ) {
		$orderby = 'tt.count';
	} else if ( 'name' == $_orderby ) {
		$orderby = 't.name';
	} else if ( 'slug' == $_orderby ) {
		$orderby = 't.slug';
	} else if ( 'term_group' == $_orderby ) {
		$orderby = 't.term_group';
	} else if ( 'none' == $_orderby ) {
		$orderby = '';
	} elseif ( empty($_orderby) || 'id' == $_orderby ) {
		$orderby = 't.term_id';
	} else {
		$orderby = 't.name';
	}
	/**
	 * Filter the ORDERBY clause of the terms query.
	 *
	 * @since 2.8.0
	 *
	 * @param string       $orderby    ORDERBY clause of the terms query.
	 * @param array        $args       An array of terms query arguments.
	 * @param string|array $taxonomies A taxonomy or array of taxonomies.
	 */
	$orderby = apply_filters( 'get_terms_orderby', $orderby, $args, $taxonomies );

	$order = strtoupper( $args['order'] );
	if ( ! empty( $orderby ) ) {
		$orderby = "ORDER BY $orderby";
	} else {
		$order = '';
	}

	if ( '' !== $order && ! in_array( $order, array( 'ASC', 'DESC' ) ) ) {
		$order = 'ASC';
	}

	$where = "tt.taxonomy IN ('" . implode("', '", $taxonomies) . "')";

	$exclude = $args['exclude'];
	$exclude_tree = $args['exclude_tree'];
	$include = $args['include'];

	$inclusions = '';
	if ( ! empty( $include ) ) {
		$exclude = '';
		$exclude_tree = '';
		$inclusions = implode( ',', wp_parse_id_list( $include ) );
	}

	if ( ! empty( $inclusions ) ) {
		$inclusions = ' AND t.term_id IN ( ' . $inclusions . ' )';
		$where .= $inclusions;
	}

	if ( ! empty( $exclude_tree ) ) {
		$exclude_tree = wp_parse_id_list( $exclude_tree );
		$excluded_children = $exclude_tree;
		foreach ( $exclude_tree as $extrunk ) {
			$excluded_children = array_merge(
				$excluded_children,
				(array) get_terms( $taxonomies[0], array( 'child_of' => intval( $extrunk ), 'fields' => 'ids', 'hide_empty' => 0 ) )
			);
		}
		$exclusions = implode( ',', array_map( 'intval', $excluded_children ) );
	} else {
		$exclusions = '';
	}

	if ( ! empty( $exclude ) ) {
		$exterms = wp_parse_id_list( $exclude );
		if ( empty( $exclusions ) ) {
			$exclusions = implode( ',', $exterms );
		} else {
			$exclusions .= ', ' . implode( ',', $exterms );
		}
	}

	if ( ! empty( $exclusions ) ) {
		$exclusions = ' AND t.term_id NOT IN (' . $exclusions . ')';
	}

	/**
	 * Filter the terms to exclude from the terms query.
	 *
	 * @since 2.3.0
	 *
	 * @param string       $exclusions NOT IN clause of the terms query.
	 * @param array        $args       An array of terms query arguments.
	 * @param string|array $taxonomies A taxonomy or array of taxonomies.
	 */
	$exclusions = apply_filters( 'list_terms_exclusions', $exclusions, $args, $taxonomies );

	if ( ! empty( $exclusions ) ) {
		$where .= $exclusions;
	}

	if ( ! empty( $args['slug'] ) ) {
		$slug = sanitize_title( $args['slug'] );
		$where .= " AND t.slug = '$slug'";
	}

	if ( ! empty( $args['name__like'] ) ) {
		$where .= $wpdb->prepare( " AND t.name LIKE %s", '%' . $wpdb->esc_like( $args['name__like'] ) . '%' );
	}

	if ( ! empty( $args['description__like'] ) ) {
		$where .= $wpdb->prepare( " AND tt.description LIKE %s", '%' . $wpdb->esc_like( $args['description__like'] ) . '%' );
	}

	if ( '' !== $parent ) {
		$parent = (int) $parent;
		$where .= " AND tt.parent = '$parent'";
	}

	$hierarchical = $args['hierarchical'];
	if ( 'count' == $args['fields'] ) {
		$hierarchical = false;
	}
	if ( $args['hide_empty'] && !$hierarchical ) {
		$where .= ' AND tt.count > 0';
	}

	$number = $args['number'];
	$offset = $args['offset'];

	// don't limit the query results when we have to descend the family tree
	if ( $number && ! $hierarchical && ! $child_of && '' === $parent ) {
		if ( $offset ) {
			$limits = 'LIMIT ' . $offset . ',' . $number;
		} else {
			$limits = 'LIMIT ' . $number;
		}
	} else {
		$limits = '';
	}

	if ( ! empty( $args['search'] ) ) {
		$like = '%' . $wpdb->esc_like( $args['search'] ) . '%';
		$where .= $wpdb->prepare( ' AND ((t.name LIKE %s) OR (t.slug LIKE %s))', $like, $like );
	}

	$selects = array();
	switch ( $args['fields'] ) {
		case 'all':
			$selects = array( 't.*', 'tt.*' );
			break;
		case 'ids':
		case 'id=>parent':
			$selects = array( 't.term_id', 'tt.parent', 'tt.count' );
			break;
		case 'names':
			$selects = array( 't.term_id', 'tt.parent', 'tt.count', 't.name' );
			break;
		case 'count':
			$orderby = '';
			$order = '';
			$selects = array( 'COUNT(*)' );
			break;
		case 'id=>name':
			$selects = array( 't.term_id', 't.name' );
			break;
		case 'id=>slug':
			$selects = array( 't.term_id', 't.slug' );
			break;
	}

	$_fields = $args['fields'];

	/**
	 * Filter the fields to select in the terms query.
	 *
	 * @since 2.8.0
	 *
	 * @param array        $selects    An array of fields to select for the terms query.
	 * @param array        $args       An array of term query arguments.
	 * @param string|array $taxonomies A taxonomy or array of taxonomies.
	 */
	$fields = implode( ', ', apply_filters( 'get_terms_fields', $selects, $args, $taxonomies ) );

	$join = "INNER JOIN $wpdb->term_taxonomy AS tt ON t.term_id = tt.term_id";

	$pieces = array( 'fields', 'join', 'where', 'orderby', 'order', 'limits' );

	/**
	 * Filter the terms query SQL clauses.
	 *
	 * @since 3.1.0
	 *
	 * @param array        $pieces     Terms query SQL clauses.
	 * @param string|array $taxonomies A taxonomy or array of taxonomies.
	 * @param array        $args       An array of terms query arguments.
	 */
	$clauses = apply_filters( 'terms_clauses', compact( $pieces ), $taxonomies, $args );
	$fields = isset( $clauses[ 'fields' ] ) ? $clauses[ 'fields' ] : '';
	$join = isset( $clauses[ 'join' ] ) ? $clauses[ 'join' ] : '';
	$where = isset( $clauses[ 'where' ] ) ? $clauses[ 'where' ] : '';
	$orderby = isset( $clauses[ 'orderby' ] ) ? $clauses[ 'orderby' ] : '';
	$order = isset( $clauses[ 'order' ] ) ? $clauses[ 'order' ] : '';
	$limits = isset( $clauses[ 'limits' ] ) ? $clauses[ 'limits' ] : '';

	$query = "SELECT $fields FROM $wpdb->terms AS t $join WHERE $where $orderby $order $limits";

	if ( 'count' == $_fields ) {
		$term_count = $wpdb->get_var($query);
		return $term_count;
	}

	$terms = $wpdb->get_results($query);
	if ( 'all' == $_fields ) {
		update_term_cache($terms);
	}

	if ( empty($terms) ) {
		wp_cache_add( $cache_key, array(), 'terms', DAY_IN_SECONDS );

		/** This filter is documented in wp-includes/taxonomy.php */
		$terms = apply_filters( 'get_terms', array(), $taxonomies, $args );
		return $terms;
	}

	if ( $child_of ) {
		$children = _get_term_hierarchy( reset( $taxonomies ) );
		if ( ! empty( $children ) ) {
			$terms = _get_term_children( $child_of, $terms, reset( $taxonomies ) );
		}
	}

	// Update term counts to include children.
	if ( $args['pad_counts'] && 'all' == $_fields ) {
		_pad_term_counts( $terms, reset( $taxonomies ) );
	}
	// Make sure we show empty categories that have children.
	if ( $hierarchical && $args['hide_empty'] && is_array( $terms ) ) {
		foreach ( $terms as $k => $term ) {
			if ( ! $term->count ) {
				$children = get_term_children( $term->term_id, reset( $taxonomies ) );
				if ( is_array( $children ) ) {
					foreach ( $children as $child_id ) {
						$child = get_term( $child_id, reset( $taxonomies ) );
						if ( $child->count ) {
							continue 2;
						}
					}
				}

				// It really is empty
				unset($terms[$k]);
			}
		}
	}
	reset( $terms );

	$_terms = array();
	if ( 'id=>parent' == $_fields ) {
		while ( $term = array_shift( $terms ) ) {
			$_terms[$term->term_id] = $term->parent;
		}
	} elseif ( 'ids' == $_fields ) {
		while ( $term = array_shift( $terms ) ) {
			$_terms[] = $term->term_id;
		}
	} elseif ( 'names' == $_fields ) {
		while ( $term = array_shift( $terms ) ) {
			$_terms[] = $term->name;
		}
	} elseif ( 'id=>name' == $_fields ) {
		while ( $term = array_shift( $terms ) ) {
			$_terms[$term->term_id] = $term->name;
		}
	} elseif ( 'id=>slug' == $_fields ) {
		while ( $term = array_shift( $terms ) ) {
			$_terms[$term->term_id] = $term->slug;
		}
	}

	if ( ! empty( $_terms ) ) {
		$terms = $_terms;
	}

	if ( $number && is_array( $terms ) && count( $terms ) > $number ) {
		$terms = array_slice( $terms, $offset, $number );
	}

	wp_cache_add( $cache_key, $terms, 'terms', DAY_IN_SECONDS );

	/** This filter is documented in wp-includes/taxonomy */
	$terms = apply_filters( 'get_terms', $terms, $taxonomies, $args );
	return $terms;
}

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/**

* Retrieve the terms in a given taxonomy or list of taxonomies.

* You can fully inject any customizations to the query before it is sent, as

* well as control the output with a filter.

* The 'get_terms' filter will be called when the cache has the term and will

* pass the found term along with the array of $taxonomies and array of $args.

* This filter is also called before the array of terms is passed and will pass

* the array of terms, along with the $taxonomies and $args.

* The 'list_terms_exclusions' filter passes the compiled exclusions along with

* the $args.

* The 'get_terms_orderby' filter passes the ORDER BY clause for the query

* along with the $args array.

* The 'get_terms_fields' filter passes the fields for the SELECT query

* along with the $args array.

* @since 2.3.0

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

* @param string|array $taxonomies Taxonomy name or list of Taxonomy names.

* @param array|string $args {

* Optional. Array or string of arguments to get terms.

* @type string $orderby Field(s) to order terms by. Accepts term fields, though

* empty defaults to 'term_id'. Default 'name'.

* @type string $order Whether to order terms in ascending or descending order.

* Accepts 'ASC' (ascending) or 'DESC' (descending).

* Default 'ASC'.

* @type bool|int $hide_empty Whether to hide terms not assigned to any posts. Accepts

* 1|true or 0|false. Default 1|true.

* @type array|string $include Array or comma/space-separated string of term ids to include.

* Default empty array.

* @type array|string $exclude Array or comma/space-separated string of term ids to exclude.

* If $include is non-empty, $exclude is ignored.

* Default empty array.

* @type array|string $exclude_tree Array or comma/space-separated string of term ids to exclude

* along with all of their descendant terms. If $include is

* non-empty, $exclude_tree is ignored. Default empty array.

* @type int $number Maximum number of terms to return. Accepts 1+ or -1 (all).

* Default -1.

* @type int $offset The number by which to offset the terms query. Default empty.

* @type string $fields Term fields to query for. Accepts 'all' (returns an array of

* term objects), 'ids' or 'names' (returns an array of integers

* or strings, respectively. Default 'all'.

* @type string $slug Slug to return term(s) for. Default empty.

* @type bool $hierarchical Whether to include terms that have non-empty descendants (even

* if $hide_empty is set to true). Default true.

* @type string $search Search criteria to match terms. Will be SQL-formatted with

* wildcards before and after. Default empty.

* @type string $name__like Retrieve terms with criteria by which a term is LIKE $name__like.

* Default empty.

* @type string $description__like Retrieve terms where the description is LIKE $description__like.

* Default empty.

* @type bool $pad_counts Whether to pad the quantity of a term's children in the quantity

* of each term's "count" object variable. Default false.

* @type string $get Whether to return terms regardless of ancestry or whether the terms

* are empty. Accepts 'all' or empty (disabled). Default empty.

* @type int $child_of Term ID to retrieve child terms of. If multiple taxonomies

* are passed, $child_of is ignored. Default 0.

* @type int|string $parent Parent term ID to retrieve direct-child terms of. Default empty.

* @type string $cache_domain Unique cache key to be produced when this query is stored in an

* object cache. Default is 'core'.

* }

* @return array|WP_Error List of Term Objects and their children. Will return WP_Error, if any of $taxonomies

* do not exist.

function get_terms( $taxonomies, $args = '' ) {

global $wpdb;

$empty_array = array();

$single_taxonomy = ! is_array( $taxonomies ) || 1 === count( $taxonomies );

if ( ! is_array( $taxonomies ) ) {

$taxonomies = array( $taxonomies );

}

foreach ( $taxonomies as $taxonomy ) {

if ( ! taxonomy_exists($taxonomy) ) {

$error = new WP_Error('invalid_taxonomy', __('Invalid taxonomy'));

return $error;

}

$defaults = array('orderby' => 'name', 'order' => 'ASC',

'hide_empty' => true, 'exclude' => array(), 'exclude_tree' => array(), 'include' => array(),

'number' => '', 'fields' => 'all', 'slug' => '', 'parent' => '',

'hierarchical' => true, 'child_of' => 0, 'get' => '', 'name__like' => '', 'description__like' => '',

'pad_counts' => false, 'offset' => '', 'search' => '', 'cache_domain' => 'core' );

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

$args['number'] = absint( $args['number'] );

$args['offset'] = absint( $args['offset'] );

if ( !$single_taxonomy || ! is_taxonomy_hierarchical( reset( $taxonomies ) ) ||

( '' !== $args['parent'] && 0 !== $args['parent'] ) ) {

$args['child_of'] = 0;

$args['hierarchical'] = false;

$args['pad_counts'] = false;

}

if ( 'all' == $args['get'] ) {

$args['child_of'] = 0;

$args['hide_empty'] = 0;

$args['hierarchical'] = false;

$args['pad_counts'] = false;

}

/**

* Filter the terms query arguments.

* @since 3.1.0

* @param array $args An array of arguments.

* @param string|array $taxonomies A taxonomy or array of taxonomies.

$args = apply_filters( 'get_terms_args', $args, $taxonomies );

$child_of = $args['child_of'];

if ( $child_of ) {

$hierarchy = _get_term_hierarchy( reset( $taxonomies ) );

if ( ! isset( $hierarchy[ $child_of ] ) ) {

return $empty_array;

}

$parent = $args['parent'];

if ( $parent ) {

$hierarchy = _get_term_hierarchy( reset( $taxonomies ) );

if ( ! isset( $hierarchy[ $parent ] ) ) {

return $empty_array;

}

// $args can be whatever, only use the args defined in defaults to compute the key

$filter_key = ( has_filter('list_terms_exclusions') ) ? serialize($GLOBALS['wp_filter']['list_terms_exclusions']) : '';

$key = md5( serialize( wp_array_slice_assoc( $args, array_keys( $defaults ) ) ) . serialize( $taxonomies ) . $filter_key );

$last_changed = wp_cache_get( 'last_changed', 'terms' );

if ( ! $last_changed ) {

$last_changed = microtime();

wp_cache_set( 'last_changed', $last_changed, 'terms' );

}

$cache_key = "get_terms:$key:$last_changed";

$cache = wp_cache_get( $cache_key, 'terms' );

if ( false !== $cache ) {

/**

* Filter the given taxonomy's terms cache.

* @since 2.3.0

* @param array $cache Cached array of terms for the given taxonomy.

* @param string|array $taxonomies A taxonomy or array of taxonomies.

* @param array $args An array of arguments to get terms.

$cache = apply_filters( 'get_terms', $cache, $taxonomies, $args );

return $cache;

}

$_orderby = strtolower( $args['orderby'] );

if ( 'count' == $_orderby ) {

$orderby = 'tt.count';

} else if ( 'name' == $_orderby ) {

$orderby = 't.name';

} else if ( 'slug' == $_orderby ) {

$orderby = 't.slug';

} else if ( 'term_group' == $_orderby ) {

$orderby = 't.term_group';

} else if ( 'none' == $_orderby ) {

$orderby = '';

} elseif ( empty($_orderby) || 'id' == $_orderby ) {

$orderby = 't.term_id';

} else {

$orderby = 't.name';

}

/**

* Filter the ORDERBY clause of the terms query.

* @since 2.8.0

* @param string $orderby ORDERBY clause of the terms query.

* @param array $args An array of terms query arguments.

* @param string|array $taxonomies A taxonomy or array of taxonomies.

$orderby = apply_filters( 'get_terms_orderby', $orderby, $args, $taxonomies );

$order = strtoupper( $args['order'] );

if ( ! empty( $orderby ) ) {

$orderby = "ORDER BY $orderby";

} else {

$order = '';

}

if ( '' !== $order && ! in_array( $order, array( 'ASC', 'DESC' ) ) ) {

$order = 'ASC';

}

$where = "tt.taxonomy IN ('" . implode("', '", $taxonomies) . "')";

$exclude = $args['exclude'];

$exclude_tree = $args['exclude_tree'];

$include = $args['include'];

$inclusions = '';

if ( ! empty( $include ) ) {

$exclude = '';

$exclude_tree = '';

$inclusions = implode( ',', wp_parse_id_list( $include ) );

}

if ( ! empty( $inclusions ) ) {

$inclusions = ' AND t.term_id IN ( ' . $inclusions . ' )';

$where .= $inclusions;

}

if ( ! empty( $exclude_tree ) ) {

$exclude_tree = wp_parse_id_list( $exclude_tree );

$excluded_children = $exclude_tree;

foreach ( $exclude_tree as $extrunk ) {

$excluded_children = array_merge(

$excluded_children,

(array) get_terms( $taxonomies[0], array( 'child_of' => intval( $extrunk ), 'fields' => 'ids', 'hide_empty' => 0 ) )

);

}

$exclusions = implode( ',', array_map( 'intval', $excluded_children ) );

} else {

$exclusions = '';

}

if ( ! empty( $exclude ) ) {

$exterms = wp_parse_id_list( $exclude );

if ( empty( $exclusions ) ) {

$exclusions = implode( ',', $exterms );

} else {

$exclusions .= ', ' . implode( ',', $exterms );

}

if ( ! empty( $exclusions ) ) {

$exclusions = ' AND t.term_id NOT IN (' . $exclusions . ')';

}

/**

* Filter the terms to exclude from the terms query.

* @since 2.3.0

* @param string $exclusions NOT IN clause of the terms query.

* @param array $args An array of terms query arguments.

* @param string|array $taxonomies A taxonomy or array of taxonomies.

$exclusions = apply_filters( 'list_terms_exclusions', $exclusions, $args, $taxonomies );

if ( ! empty( $exclusions ) ) {

$where .= $exclusions;

}

if ( ! empty( $args['slug'] ) ) {

$slug = sanitize_title( $args['slug'] );

$where .= " AND t.slug = '$slug'";

}

if ( ! empty( $args['name__like'] ) ) {

$where .= $wpdb->prepare( " AND t.name LIKE %s", '%' . $wpdb->esc_like( $args['name__like'] ) . '%' );

}

if ( ! empty( $args['description__like'] ) ) {

$where .= $wpdb->prepare( " AND tt.description LIKE %s", '%' . $wpdb->esc_like( $args['description__like'] ) . '%' );

}

if ( '' !== $parent ) {

$parent = (int) $parent;

$where .= " AND tt.parent = '$parent'";

}

$hierarchical = $args['hierarchical'];

if ( 'count' == $args['fields'] ) {

$hierarchical = false;

}

if ( $args['hide_empty'] && !$hierarchical ) {

$where .= ' AND tt.count > 0';

}

$number = $args['number'];

$offset = $args['offset'];

// don't limit the query results when we have to descend the family tree

if ( $number && ! $hierarchical && ! $child_of && '' === $parent ) {

if ( $offset ) {

$limits = 'LIMIT ' . $offset . ',' . $number;

} else {

$limits = 'LIMIT ' . $number;

}

} else {

$limits = '';

}

if ( ! empty( $args['search'] ) ) {

$like = '%' . $wpdb->esc_like( $args['search'] ) . '%';

$where .= $wpdb->prepare( ' AND ((t.name LIKE %s) OR (t.slug LIKE %s))', $like, $like );

}

$selects = array();

switch ( $args['fields'] ) {

case 'all':

$selects = array( 't.*', 'tt.*' );

break;

case 'ids':

case 'id=>parent':

$selects = array( 't.term_id', 'tt.parent', 'tt.count' );

break;

case 'names':

$selects = array( 't.term_id', 'tt.parent', 'tt.count', 't.name' );

break;

case 'count':

$orderby = '';

$order = '';

$selects = array( 'COUNT(*)' );

break;

case 'id=>name':

$selects = array( 't.term_id', 't.name' );

break;

case 'id=>slug':

$selects = array( 't.term_id', 't.slug' );

break;

}

$_fields = $args['fields'];

/**

* Filter the fields to select in the terms query.

* @since 2.8.0

* @param array $selects An array of fields to select for the terms query.

* @param array $args An array of term query arguments.

* @param string|array $taxonomies A taxonomy or array of taxonomies.

$fields = implode( ', ', apply_filters( 'get_terms_fields', $selects, $args, $taxonomies ) );

$join = "INNER JOIN $wpdb->term_taxonomy AS tt ON t.term_id = tt.term_id";

$pieces = array( 'fields', 'join', 'where', 'orderby', 'order', 'limits' );

/**

* Filter the terms query SQL clauses.

* @since 3.1.0

* @param array $pieces Terms query SQL clauses.

* @param string|array $taxonomies A taxonomy or array of taxonomies.

* @param array $args An array of terms query arguments.

$clauses = apply_filters( 'terms_clauses', compact( $pieces ), $taxonomies, $args );

$fields = isset( $clauses[ 'fields' ] ) ? $clauses[ 'fields' ] : '';

$join = isset( $clauses[ 'join' ] ) ? $clauses[ 'join' ] : '';

$where = isset( $clauses[ 'where' ] ) ? $clauses[ 'where' ] : '';

$orderby = isset( $clauses[ 'orderby' ] ) ? $clauses[ 'orderby' ] : '';

$order = isset( $clauses[ 'order' ] ) ? $clauses[ 'order' ] : '';

$limits = isset( $clauses[ 'limits' ] ) ? $clauses[ 'limits' ] : '';

$query = "SELECT $fields FROM $wpdb->terms AS t $join WHERE $where $orderby $order $limits";

if ( 'count' == $_fields ) {

$term_count = $wpdb->get_var($query);

return $term_count;

}

$terms = $wpdb->get_results($query);

if ( 'all' == $_fields ) {

update_term_cache($terms);

}

if ( empty($terms) ) {

wp_cache_add( $cache_key, array(), 'terms', DAY_IN_SECONDS );

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

$terms = apply_filters( 'get_terms', array(), $taxonomies, $args );

return $terms;

}

if ( $child_of ) {

$children = _get_term_hierarchy( reset( $taxonomies ) );

if ( ! empty( $children ) ) {

$terms = _get_term_children( $child_of, $terms, reset( $taxonomies ) );

}

// Update term counts to include children.

if ( $args['pad_counts'] && 'all' == $_fields ) {

_pad_term_counts( $terms, reset( $taxonomies ) );

}

// Make sure we show empty categories that have children.

if ( $hierarchical && $args['hide_empty'] && is_array( $terms ) ) {

foreach ( $terms as $k => $term ) {

if ( ! $term->count ) {

$children = get_term_children( $term->term_id, reset( $taxonomies ) );

if ( is_array( $children ) ) {

foreach ( $children as $child_id ) {

$child = get_term( $child_id, reset( $taxonomies ) );

if ( $child->count ) {

continue 2;

}

// It really is empty

unset($terms[$k]);

}

reset( $terms );

$_terms = array();

if ( 'id=>parent' == $_fields ) {

while ( $term = array_shift( $terms ) ) {

$_terms[$term->term_id] = $term->parent;

}

} elseif ( 'ids' == $_fields ) {

while ( $term = array_shift( $terms ) ) {

$_terms[] = $term->term_id;

}

} elseif ( 'names' == $_fields ) {

while ( $term = array_shift( $terms ) ) {

$_terms[] = $term->name;

}

} elseif ( 'id=>name' == $_fields ) {

while ( $term = array_shift( $terms ) ) {

$_terms[$term->term_id] = $term->name;

}

} elseif ( 'id=>slug' == $_fields ) {

while ( $term = array_shift( $terms ) ) {

$_terms[$term->term_id] = $term->slug;

}

if ( ! empty( $_terms ) ) {

$terms = $_terms;

}

if ( $number && is_array( $terms ) && count( $terms ) > $number ) {

$terms = array_slice( $terms, $offset, $number );

}

wp_cache_add( $cache_key, $terms, 'terms', DAY_IN_SECONDS );

/** This filter is documented in wp-includes/taxonomy */

$terms = apply_filters( 'get_terms', $terms, $taxonomies, $args );

return $terms;

}

- Wordpress

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