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class-fieldmanager-util-term-meta.php
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class-fieldmanager-util-term-meta.php
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<?php
/**
* Class file for Fieldmanager_Util_Term_Meta
*
* @package Fieldmanager
*/
/**
* Use Fieldmanager to store meta data for taxonomy terms.
*
* This is deprecated as of WordPress 4.4, which introduces term meta into core.
* If you were using this feature prior to 4.4, it will continue to operate
* until probably WordPress 4.8, however it is in your best interest to migrate
* your data ASAP, as core's term meta is significantly more efficient.
*
* @deprecated 1.0.0-beta.3
*/
class Fieldmanager_Util_Term_Meta {
/**
* Instance of the class
*
* @var Term_Meta
* @access private
*/
private static $instance;
/**
* Post type name
*
* @var string
* @access private
*/
private $post_type = 'fm-term-meta';
/**
* Singleton helper
*
* @return object The singleton instance
*/
public static function instance() {
if ( ! isset( self::$instance ) ) {
self::$instance = new Fieldmanager_Util_Term_Meta();
self::$instance->setup();
}
return self::$instance;
}
/**
* Sets up the class.
*/
public function setup() {
add_action( 'init', array( $this, 'create_content_type' ) );
add_action( 'delete_term', array( $this, 'collect_garbage' ), 10, 3 );
add_action( 'split_shared_term', array( $this, 'split_shared_term' ), 10, 4 );
}
/**
* Create the custom content type.
*/
public function create_content_type() {
// phpcs:ignore WordPress.NamingConventions.ValidPostTypeSlug.NotStringLiteral -- baseline
register_post_type(
$this->post_type,
array(
'rewrite' => false,
'label' => __( 'Fieldmanager Term Metadata', 'fieldmanager' ),
)
);
}
/**
* Get the slug (post_name and post_title) for the fm_term_meta post.
*
* @param int $term_id Term ID.
* @param string $taxonomy Term taxonomy.
* @return string Post slug.
*/
protected function post_slug( $term_id, $taxonomy ) {
return $this->post_type . '-' . $term_id . '-' . $taxonomy;
}
/**
* Get metadata matching the specified key for the given term ID/taxonomy
* pair.
*
* @param int $term_id Term ID.
* @param string $taxonomy Taxonomy name that $term_id is part of.
* @param string $meta_key Metadata name.
* @param bool $single Optional. Get a single result or multiple.
* @return string|array @see get_post_meta().
*/
public function get_term_meta( $term_id, $taxonomy, $meta_key = '', $single = false ) {
// Check if this term has a post to store meta data.
$term_meta_post_id = $this->get_term_meta_post_id( $term_id, $taxonomy );
if ( false === $term_meta_post_id ) {
/*
* If not, exit. There is no meta data for this term at all. Mimic
* the normal return behavior of get_post_meta().
*/
return $single ? '' : array();
}
// Get the meta data.
return get_post_meta( $term_meta_post_id, $meta_key, $single );
}
/**
* Add metadata to a term ID/taxonomy pair.
*
* @param int $term_id Term ID.
* @param string $taxonomy Taxonomy name that $term_id is part of.
* @param string $meta_key Metadata name.
* @param mixed $meta_value The value of the custom field which should be
* added. If an array is given, it will be
* serialized into a string.
* @param bool $unique Optional. Whether or not you want the key to stay
* unique. When set to true, the custom field will
* not be added if the given key already exists among
* custom fields of the specified post.
* @return bool|int @see add_post_meta().
*/
public function add_term_meta( $term_id, $taxonomy, $meta_key, $meta_value, $unique = false ) {
// Check if this term already has a post to store meta data.
$term_meta_post_id = $this->get_term_meta_post_id( $term_id, $taxonomy );
if ( false === $term_meta_post_id ) {
// If not, create the post to store the metadata.
$term_meta_post_id = $this->add_term_meta_post( $term_id, $taxonomy );
// Check for errors.
if ( false === $term_meta_post_id ) {
return false;
}
}
// Add this key/value pair as post meta data.
return add_post_meta( $term_meta_post_id, $meta_key, $meta_value, $unique );
}
/**
* Update metadata for a term ID/taxonomy pair.
*
* Use the $prev_value parameter to differentiate between meta fields with
* the same key and post ID.
*
* If the meta field for the term does not exist, it will be added.
*
* @param int $term_id Term ID.
* @param string $taxonomy Taxonomy name that $term_id is part of.
* @param string $meta_key Metadata name.
* @param mixed $meta_value The new value of the custom field. A passed
* array will be serialized into a string.
* @param mixed $meta_prev_value Optional. The old value of the custom field
* you wish to change. This is to
* differentiate between several fields with
* the same key. If omitted, and there are
* multiple rows for this post and meta key,
* all meta values will be updated.
* @return mixed @see update_post_meta().
*/
public function update_term_meta( $term_id, $taxonomy, $meta_key, $meta_value, $meta_prev_value = '' ) {
// Check if this term already has a post to store meta data.
$term_meta_post_id = $this->get_term_meta_post_id( $term_id, $taxonomy );
if ( false === $term_meta_post_id ) {
// If not, create the post to store the metadata.
$term_meta_post_id = $this->add_term_meta_post( $term_id, $taxonomy );
// Check for errors.
if ( false === $term_meta_post_id ) {
return false;
}
}
// Add this key/value pair as post meta data.
return update_post_meta( $term_meta_post_id, $meta_key, $meta_value, $meta_prev_value );
}
/**
* Remove metadata matching criteria from a term ID/taxonomy pair.
*
* You can match based on the key, or key and value. Removing based on key
* and value, will keep from removing duplicate metadata with the same key.
* It also allows removing all metadata matching key, if needed.
*
* @param int $term_id Term ID.
* @param string $taxonomy Taxonomy name that $term_id is part of.
* @param string $meta_key Metadata name.
* @param mixed $meta_value Optional. The value of the field you will
* delete. This is used to differentiate between
* several fields with the same key. If left blank,
* all fields with the given key will be deleted.
* @return bool False for failure. True for success.
*/
public function delete_term_meta( $term_id, $taxonomy, $meta_key, $meta_value = '' ) {
// Get the post used for this term.
$term_meta_post_id = $this->get_term_meta_post_id( $term_id, $taxonomy );
// If no post exist, there is nothing further to do here. This is not necessarily an error.
if ( false === $term_meta_post_id ) {
return false;
}
// Remove the meta data.
$result = delete_post_meta( $term_meta_post_id, $meta_key, $meta_value );
// Check if this term has any metadata at all.
$post_terms = get_post_meta( $term_meta_post_id );
if ( empty( $post_terms ) ) {
// If not, remove the post to store the metadata to free up space in wp_posts.
wp_delete_post( $term_meta_post_id, true );
$this->delete_term_meta_post_id_cache( $term_id, $taxonomy );
}
return $result;
}
/**
* Handles checking if post exists and returning its ID to store taxonomy term meta data.
*
* @param int $term_id Term ID.
* @param string $taxonomy Term taxonomy.
* @return int|bool Post ID or false.
*/
public function get_term_meta_post_id( $term_id, $taxonomy ) {
$cache_key = $this->get_term_meta_post_id_cache_key( $term_id, $taxonomy );
$term_meta_post_id = wp_cache_get( $cache_key );
if ( false === $term_meta_post_id ) {
// Check if a post exists for this term.
$query = new WP_Query(
array(
'name' => $this->post_slug( $term_id, $taxonomy ),
'post_type' => $this->post_type,
)
);
// Return the post ID if it exists, otherwise false.
if ( $query->have_posts() ) {
$query->next_post();
$term_meta_post_id = $query->post->ID;
} else {
$term_meta_post_id = 'none';
}
wp_cache_set( $cache_key, $term_meta_post_id );
}
return 'none' === $term_meta_post_id ? false : $term_meta_post_id;
}
/**
* Generates a standardized cache key for the term meta post ID.
*
* @param int $term_id Term ID.
* @param string $taxonomy Term taxonomy.
* @return string Cache key.
*/
public function get_term_meta_post_id_cache_key( $term_id, $taxonomy ) {
return "fm_tm_{$term_id}_{$taxonomy}";
}
/**
* Clears the cache for a term meta post ID.
*
* @param int $term_id Term ID.
* @param string $taxonomy Term taxonomy.
*/
public function delete_term_meta_post_id_cache( $term_id, $taxonomy ) {
wp_cache_delete( $this->get_term_meta_post_id_cache_key( $term_id, $taxonomy ) );
}
/**
* Handles adding a post to store taxonomy term meta data.
*
* @param int $term_id Term ID.
* @param string $taxonomy Term taxonomy.
* @return bool
*/
public function add_term_meta_post( $term_id, $taxonomy ) {
$this->delete_term_meta_post_id_cache( $term_id, $taxonomy );
// Add the skeleton post to store meta data for this taxonomy term.
$result = wp_insert_post(
array(
'post_name' => $this->post_slug( $term_id, $taxonomy ),
'post_title' => $this->post_slug( $term_id, $taxonomy ),
'post_type' => $this->post_type,
'post_status' => 'publish',
)
);
// Check the result.
// phpcs:ignore WordPress.PHP.StrictComparisons.LooseComparison -- baseline
if ( 0 != $result ) {
return $result;
} else {
return false;
}
}
/**
* When a term is deleted, delete its ghost post and related meta.
*
* @param int $term_id Term ID.
* @param int $tt_id Term taxonomy ID.
* @param string $taxonomy Term taxonomy.
*/
public function collect_garbage( $term_id, $tt_id, $taxonomy ) {
// phpcs:ignore WordPressVIPMinimum.Functions.RestrictedFunctions.get_page_by_path_get_page_by_path -- baseline
$post = get_page_by_path( $this->post_slug( $term_id, $taxonomy ), OBJECT, $this->post_type );
if ( $post ) {
wp_delete_post( $post->ID, true );
}
}
/**
* Update term meta when a shared term gets split (as of WordPress 4.2).
*
* @param int $old_term_id The pre-split (previously shared) term ID.
* @param int $new_term_id The post-split term ID.
* @param int $term_taxonomy_id The term_taxonomy_id for this term. Note
* that this doesn't change when a shared term
* is split (since it's already unique).
* @param string $taxonomy The taxonomy of the *split* term.
*/
public function split_shared_term( $old_term_id, $new_term_id, $term_taxonomy_id, $taxonomy ) {
$post_id = $this->get_term_meta_post_id( $old_term_id, $taxonomy );
// phpcs:ignore WordPress.PHP.StrictComparisons.LooseComparison -- baseline
if ( false != $post_id ) {
wp_update_post(
array(
'ID' => $post_id,
'post_name' => $this->post_slug( $new_term_id, $taxonomy ),
'post_title' => $this->post_slug( $new_term_id, $taxonomy ),
)
);
$this->delete_term_meta_post_id_cache( $old_term_id, $taxonomy );
}
}
}
/**
* Singleton helper for Fieldmanager_Util_Term_Meta
*
* @deprecated 1.0.0-beta.3
*
* @return object
*/
function fieldmanager_util_term_meta() {
return Fieldmanager_Util_Term_Meta::instance();
}
fieldmanager_util_term_meta();
/**
* Shortcut helper for Fieldmanager_Util_Term_Meta::get_term_meta().
*
* @deprecated 1.0.0-beta.3
*
* @see Fieldmanager_Util_Term_Meta::get_term_meta()
*
* @param int $term_id Term ID.
* @param string $taxonomy Term taxonomy.
* @param string $meta_key Optional. Meta key.
* @param bool $single Optional. Whether to return a single value for $meta_key.
* @return mixed
*/
function fm_get_term_meta( $term_id, $taxonomy, $meta_key = '', $single = false ) {
return Fieldmanager_Util_Term_Meta()->get_term_meta( $term_id, $taxonomy, $meta_key, $single );
}
/**
* Shortcut helper for Fieldmanager_Util_Term_Meta::add_term_meta().
*
* @deprecated 1.0.0-beta.3
*
* @see Fieldmanager_Util_Term_Meta::add_term_meta()
*
* @param int $term_id Term ID.
* @param string $taxonomy Term taxonomy.
* @param string $meta_key Meta key.
* @param mixed $meta_value Meta value.
* @param bool $unique Whether to bail if the term has an existing $meta_key.
* @return mixed
*/
function fm_add_term_meta( $term_id, $taxonomy, $meta_key, $meta_value, $unique = false ) {
return Fieldmanager_Util_Term_Meta()->add_term_meta( $term_id, $taxonomy, $meta_key, $meta_value, $unique );
}
/**
* Shortcut helper for Fieldmanager_Util_Term_Meta::update_term_meta().
*
* @deprecated 1.0.0-beta.3
*
* @see Fieldmanager_Util_Term_Meta::update_term_meta()
*
* @param int $term_id Term ID.
* @param string $taxonomy Term taxonomy.
* @param string $meta_key Meta key.
* @param mixed $meta_value Meta value.
* @param string $meta_prev_value Optional. Previous meta value to change.
* @return mixed
*/
function fm_update_term_meta( $term_id, $taxonomy, $meta_key, $meta_value, $meta_prev_value = '' ) {
return Fieldmanager_Util_Term_Meta()->update_term_meta( $term_id, $taxonomy, $meta_key, $meta_value, $meta_prev_value );
}
/**
* Shortcut helper for Fieldmanager_Util_Term_Meta::delete_term_meta().
*
* @deprecated 1.0.0-beta.3
*
* @see Fieldmanager_Util_Term_Meta::delete_term_meta()
*
* @param int $term_id Term ID.
* @param string $taxonomy Term taxonomy.
* @param string $meta_key Meta key.
* @param string $meta_value Optional. Meta value to delete.
* @return bool
*/
function fm_delete_term_meta( $term_id, $taxonomy, $meta_key, $meta_value = '' ) {
return Fieldmanager_Util_Term_Meta()->delete_term_meta( $term_id, $taxonomy, $meta_key, $meta_value );
}