WordPress/wp-includes/cache-compat.php

<?php
/**
 * Object Cache API functions missing from 3rd party object caches.
 *
 * @link https://codex.wordpress.org/Class_Reference/WP_Object_Cache
 *
 * @package WordPress
 * @subpackage Cache
 */

if ( ! function_exists( 'wp_cache_get_multiple' ) ) :
	/**
	 * Retrieves multiple values from the cache in one call.
	 *
	 * Compat function to mimic wp_cache_get_multiple().
	 *
	 * @ignore
	 * @since 5.5.0
	 *
	 * @see wp_cache_get_multiple()
	 *
	 * @param array  $keys  Array of keys under which the cache contents are stored.
	 * @param string $group Optional. Where the cache contents are grouped. Default empty.
	 * @param bool   $force Optional. Whether to force an update of the local cache
	 *                      from the persistent cache. Default false.
	 * @return array Array of values organized into groups.
	 */
	function wp_cache_get_multiple( $keys, $group = '', $force = false ) {
		$values = array();

		foreach ( $keys as $key ) {
			$values[ $key ] = wp_cache_get( $key, $group, $force );
		}

		return $values;
	}
endif;

if ( ! function_exists( 'wp_cache_delete_multiple' ) ) :
	/**
	 * Deletes multiple values from the cache in one call.
	 *
	 * Compat function to mimic wp_cache_delete_multiple().
	 *
	 * @ignore
	 * @since 6.0.0
	 *
	 * @see wp_cache_delete_multiple()
	 *
	 * @param array  $keys  Array of keys under which the cache to deleted.
	 * @param string $group Optional. Where the cache contents are grouped. Default empty.
	 * @return array Array of return values.
	 */
	function wp_cache_delete_multiple( array $keys, $group = '' ) {
		$values = array();

		foreach ( $keys as $key ) {
			$values[ $key ] = wp_cache_delete( $key, $group );
		}

		return $values;
	}
endif;


if ( ! function_exists( 'wp_cache_add_multiple' ) ) :
	/**
	 * Adds multiple values to the cache in one call, if the cache keys don't already exist.
	 *
	 * Compat function to mimic wp_cache_add_multiple().
	 *
	 * @ignore
	 * @since 6.0.0
	 *
	 * @see wp_cache_add_multiple()
	 *
	 * @param array  $data   Array of keys and values to be added.
	 * @param string $group  Optional. Where the cache contents are grouped. Default empty.
	 * @param int    $expire Optional. When to expire the cache contents, in seconds.
	 *                       Default 0 (no expiration).
	 * @return array Array of return values.
	 */
	function wp_cache_add_multiple( array $data, $group = '', $expire = 0 ) {
		$values = array();

		foreach ( $data as $key => $value ) {
			$values[ $key ] = wp_cache_add( $key, $value, $group, $expire );
		}

		return $values;
	}
endif;

if ( ! function_exists( 'wp_cache_set_multiple' ) ) :
	/**
	 * Sets multiple values to the cache in one call.
	 *
	 * Differs from wp_cache_add_multiple() in that it will always write data.
	 *
	 * Compat function to mimic wp_cache_set_multiple().
	 *
	 * @ignore
	 * @since 6.0.0
	 *
	 * @see wp_cache_set_multiple()
	 *
	 * @param array  $data   Array of keys and values to be set.
	 * @param string $group  Optional. Where the cache contents are grouped. Default empty.
	 * @param int    $expire Optional. When to expire the cache contents, in seconds.
	 *                       Default 0 (no expiration).
	 * @return array Array of return values.
	 */
	function wp_cache_set_multiple( array $data, $group = '', $expire = 0 ) {
		$values = array();

		foreach ( $data as $key => $value ) {
			$values[ $key ] = wp_cache_set( $key, $value, $group, $expire );
		}

		return $values;
	}
endif;