WordPress/wp-includes/taxonomy.php

174 lines
6.1 KiB
PHP

<?php
// TODO: add_term(), edit_term(), and remove_term() work with terms within context of
// taxonomies. insert_term(), update_term(), delete_term() work with just the terms table.
// insert_term_taxonomy(), update_term_taxonomy(), and delete_term_taxonomy() work
// with just the term taxonomy table. Right now we only have add_term().
/**
* Adds a new term to the database. Optionally marks it as an alias of an existing term.
* @param string $term The term to add.
* @param string $taxonomy The taxonomy to which to add the term
* @param int|string $alias_of The id or slug of the new term's alias.
*/
function add_term( $term, $taxonomy, $args = array() ) {
global $wpdb;
$slug = sanitize_title($term);
$defaults = array( 'alias_of' => '', 'description' => '', 'parent' => 0);
$args = wp_parse_args($args, $defaults);
extract($args);
$term_group = 0;
if ( $alias_of ) {
$alias = $wpdb->fetch_row("SELECT term_id, term_group FROM $wpdb->terms WHERE slug = '$alias_of'");
if ( $alias->term_group ) {
// The alias we want is already in a group, so let's use that one.
$term_group = $alias->term_group;
} else {
// The alias isn't in a group, so let's create a new one and firstly add the alias term to it.
$term_group = $wpdb->get_var("SELECT MAX() term_group FROM $wpdb->terms GROUP BY term_group") + 1;
$wpdb->query("UPDATE $wpdb->terms SET term_group = $term_group WHERE term_id = $alias->term_id");
}
}
if ( ! $term_id = is_term($slug) ) {
$wpdb->query("INSERT INTO $wpdb->terms (name, slug, term_group) VALUES ('$term', '$slug', '$term_group')");
$term_id = (int) $wpdb->insert_id;
}
$tt_id = $wpdb->get_var("SELECT tt.term_taxonomy_id FROM $wpdb->term_taxonomy AS tt INNER JOIN $wpdb->terms AS t ON tt.term_id = t.term_id WHERE tt.taxonomy = '$taxonomy' AND t.term_id = $term_id");
if ( !empty($tt_id) )
return $term_id;
$wpdb->query("INSERT INTO $wpdb->term_taxonomy (term_id, taxonomy, description, parent, count) VALUES ('$term_id', '$taxonomy', '$description', '$parent', '0')");
// TODO: Maybe return both term_id and tt_id.
return $term_id;
}
/**
* Removes a term from the database.
*/
function remove_term() {}
/**
* Returns the index of a defined term, or 0 (false) if the term doesn't exist.
*/
function is_term($term, $taxonomy = '') {
global $wpdb;
if ( ! $term = sanitize_title($term) )
return 0;
return $wpdb->get_var("SELECT term_id FROM $wpdb->terms WHERE slug = '$term'");
}
/**
* Given an array of terms, returns those that are defined term slugs. Ignores integers.
* @param array $terms The term slugs to check for a definition.
*/
function get_defined_terms($terms) {
global $wpdb;
foreach ( $terms as $term ) {
if ( !is_int($term) )
$searches[] = $term;
}
$terms = "'" . implode("', '", $searches) . "'";
return $wpdb->get_col("SELECT slug FROM $wpdb->terms WHERE slug IN ($terms)");
}
/**
* Relates an object (post, link etc) to a term and taxonomy type. Creates the term and taxonomy
* relationship if it doesn't already exist. Creates a term if it doesn't exist (using the slug).
* @param array|int|string $term The slug or id of the term.
* @param int $object_id The object to relate to.
* @param array|string $taxonomies The context(s) in which to relate the term to the object.
*/
function add_term_relationship($terms, $object_id, $taxonomies) {
global $wpdb;
if ( !is_array($taxonomies) )
$taxonomies = array($taxonomies);
if ( !is_array($terms) )
$terms = array($terms);
$defined_terms = get_defined_terms($terms);
foreach ( $terms as $term ) {
if ( !is_int($term) ) {
if ( !isset($defined_terms[$term]) )
$new_terms[] = $term;
$slugs[] = $term;
} else {
$term_ids[] = $term;
}
}
$term_clause = isset($term_ids) ? 'tt.term_id IN (' . implode(', ', $term_ids) . ')' : '';
if ( isset($slugs) ) {
if ($term_clause) {
$term_clause .= ' OR ';
}
$term_clause .= "t.slug IN ('" . implode("', '", $slugs) . "')";
$term_join = "INNER JOIN $wpdb->terms AS t ON tt.term_id = t.term_id";
} else {
$term_join = '';
}
// Now add or increment the term taxonomy relationships. This is inefficient at the moment.
foreach ( $taxonomies as $taxonomy ) {
foreach ( $terms as $term ) {
add_term($term, $taxonomy);
}
}
$taxonomies = "'" . implode("', '", $taxonomies) . "'";
// Finally, relate the term and taxonomy to the object.
// Use IGNORE to avoid dupe warnings for now.
$wpdb->query("INSERT IGNORE INTO $wpdb->term_relationships(object_id, term_taxonomy_id) SELECT '$object_id', term_taxonomy_id FROM $wpdb->term_taxonomy AS tt $term_join WHERE ($term_clause) AND tt.taxonomy IN ($taxonomies)");
}
/**
* Returns the terms associated with the given object(s), in the supplied taxonomies.
* @param int|array $object_id The id of the object(s)) to retrieve for.
* @param string|array $taxonomies The taxonomies to retrieve terms from.
* @return array The requested term data.
*/
function get_object_terms($object_id, $taxonomy) {
global $wpdb;
$taxonomies = ($single_taxonomy = !is_array($taxonomy)) ? array($taxonomy) : $taxonomy;
$object_ids = ($single_object = !is_array($object_id)) ? array($object_id) : $object_id;
$taxonomies = "'" . implode("', '", $taxonomies) . "'";
$object_ids = implode(', ', $object_ids);
if ( $taxonomy_data = $wpdb->get_results("SELECT t.* FROM $wpdb->terms AS t INNER JOIN $wpdb->term_taxonomy AS tt ON tt.term_id = t.term_id INNER JOIN $wpdb->term_relationships AS tr ON tr.term_taxonomy_id = tt.term_taxonomy_id WHERE tt.taxonomy IN ($taxonomies) AND tr.object_id IN ($object_ids)") ) {
if ($single_taxonomy && $single_object) {
// Just one kind of taxonomy for one object.
return $taxonomy_data;
} else {
foreach ($taxonomy_data as $data) {
if ($single_taxonomy) {
// Many objects, one taxonomy type.
$return[$data->object_id][] = $data;
} elseif ($single_object) {
// One object, many taxonomies.
$return[$data->taxonomy][] = $data;
} else {
// Many objects, many taxonomies.
$return[$data->object_id][$data->taxonomy][] = $data;
}
}
return $return;
}
} else {
return array();
}
}
?>