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[EDIT] FILE: cache-compat.php

<?php
/**
 * Object Cache API functions missing from 3rd party object caches.
 *
 * @link https://developer.wordpress.org/reference/classes/wp_object_cache/
 *
 * @package WordPress
 * @subpackage Cache
 */

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 bool[] Array of return values, grouped by key. Each value is either
	 *                true on success, or false if cache key and group already exist.
	 */
	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 bool[] Array of return values, grouped by key. Each value is either
	 *                true on success, or false on failure.
	 */
	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;

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 return values, grouped by key. Each value is either
	 *               the cache contents on success, or false on failure.
	 */
	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 bool[] Array of return values, grouped by key. Each value is either
	 *                true on success, or false if the contents were not deleted.
	 */
	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_flush_runtime' ) ) :
	/**
	 * Removes all cache items from the in-memory runtime cache.
	 *
	 * Compat function to mimic wp_cache_flush_runtime().
	 *
	 * @ignore
	 * @since 6.0.0
	 *
	 * @see wp_cache_flush_runtime()
	 *
	 * @return bool True on success, false on failure.
	 */
	function wp_cache_flush_runtime() {
		if ( ! wp_cache_supports( 'flush_runtime' ) ) {
			_doing_it_wrong(
				__FUNCTION__,
				__( 'Your object cache implementation does not support flushing the in-memory runtime cache.' ),
				'6.1.0'
			);

return false;
		}

return wp_cache_flush();
	}
endif;

if ( ! function_exists( 'wp_cache_flush_group' ) ) :
	/**
	 * Removes all cache items in a group, if the object cache implementation supports it.
	 *
	 * Before calling this function, always check for group flushing support using the
	 * `wp_cache_supports( 'flush_group' )` function.
	 *
	 * @since 6.1.0
	 *
	 * @see WP_Object_Cache::flush_group()
	 * @global WP_Object_Cache $wp_object_cache Object cache global instance.
	 *
	 * @param string $group Name of group to remove from cache.
	 * @return bool True if group was flushed, false otherwise.
	 */
	function wp_cache_flush_group( $group ) {
		global $wp_object_cache;

if ( ! wp_cache_supports( 'flush_group' ) ) {
			_doing_it_wrong(
				__FUNCTION__,
				__( 'Your object cache implementation does not support flushing individual groups.' ),
				'6.1.0'
			);

return false;
		}

return $wp_object_cache->flush_group( $group );
	}
endif;

if ( ! function_exists( 'wp_cache_supports' ) ) :
	/**
	 * Determines whether the object cache implementation supports a particular feature.
	 *
	 * @since 6.1.0
	 *
	 * @param string $feature Name of the feature to check for. Possible values include:
	 *                        'add_multiple', 'set_multiple', 'get_multiple', 'delete_multiple',
	 *                        'flush_runtime', 'flush_group'.
	 * @return bool True if the feature is supported, false otherwise.
	 */
	function wp_cache_supports( $feature ) {
		return false;
	}
endif;

if ( ! function_exists( 'wp_cache_get_salted' ) ) :
	/**
	 * Retrieves cached data if valid and unchanged.
	 *
	 * @since 6.9.0
	 *
	 * @param string          $cache_key The cache key used for storage and retrieval.
	 * @param string          $group     The cache group used for organizing data.
	 * @param string|string[] $salt      The timestamp (or multiple timestamps if an array) indicating when the cache group(s) were last updated.
	 * @return mixed|false The cached data if valid, or false if the cache does not exist or is outdated.
	 */
	function wp_cache_get_salted( $cache_key, $group, $salt ) {
		$salt  = is_array( $salt ) ? implode( ':', $salt ) : $salt;
		$cache = wp_cache_get( $cache_key, $group );

if ( ! is_array( $cache ) ) {
			return false;
		}

if ( ! isset( $cache['salt'] ) || ! isset( $cache['data'] ) || $salt !== $cache['salt'] ) {
			return false;
		}

return $cache['data'];
	}
endif;

if ( ! function_exists( 'wp_cache_set_salted' ) ) :
	/**
	 * Stores salted data in the cache.
	 *
	 * @since 6.9.0
	 *
	 * @param string          $cache_key The cache key under which to store the data.
	 * @param mixed           $data      The data to be cached.
	 * @param string          $group     The cache group to which the data belongs.
	 * @param string|string[] $salt      The timestamp (or multiple timestamps if an array) indicating when the cache group(s) were last updated.
	 * @param int             $expire    Optional. When to expire the cache contents, in seconds.
	 *                                   Default 0 (no expiration).
	 * @return bool True on success, false on failure.
	 */
	function wp_cache_set_salted( $cache_key, $data, $group, $salt, $expire = 0 ) {
		$salt = is_array( $salt ) ? implode( ':', $salt ) : $salt;
		return wp_cache_set(
			$cache_key,
			array(
				'data' => $data,
				'salt' => $salt,
			),
			$group,
			$expire
		);
	}
endif;

if ( ! function_exists( 'wp_cache_get_multiple_salted' ) ) :
	/**
	 * Retrieves multiple items from the cache, only considering valid and unchanged items.
	 *
	 * @since 6.9.0
	 *
	 * @param array           $cache_keys Array of cache keys to retrieve.
	 * @param string          $group      The group of the cache to check.
	 * @param string|string[] $salt       The timestamp (or multiple timestamps if an array) indicating when the cache group(s) were last updated.
	 * @return array An associative array containing cache values. Values are `false` if they are not found or outdated.
	 */
	function wp_cache_get_multiple_salted( $cache_keys, $group, $salt ) {
		$salt  = is_array( $salt ) ? implode( ':', $salt ) : $salt;
		$cache = wp_cache_get_multiple( $cache_keys, $group );

foreach ( $cache as $key => $value ) {
			if ( ! is_array( $value ) ) {
				$cache[ $key ] = false;
				continue;
			}
			if ( ! isset( $value['salt'], $value['data'] ) || $salt !== $value['salt'] ) {
				$cache[ $key ] = false;
				continue;
			}
			$cache[ $key ] = $value['data'];
		}

return $cache;
	}
endif;

if ( ! function_exists( 'wp_cache_set_multiple_salted' ) ) :
	/**
	 * Stores multiple pieces of salted data in the cache.
	 *
	 * @since 6.9.0
	 *
	 * @param mixed           $data   Data to be stored in the cache for all keys.
	 * @param string          $group  Group to which the cached data belongs.
	 * @param string|string[] $salt   The timestamp (or multiple timestamps if an array) indicating when the cache group(s) were last updated.
	 * @param int             $expire Optional. When to expire the cache contents, in seconds.
	 *                                Default 0 (no expiration).
	 * @return bool[] Array of return values, grouped by key. Each value is either
	 *                true on success, or false on failure.
	 */
	function wp_cache_set_multiple_salted( $data, $group, $salt, $expire = 0 ) {
		$salt      = is_array( $salt ) ? implode( ':', $salt ) : $salt;
		$new_cache = array();
		foreach ( $data as $key => $value ) {
			$new_cache[ $key ] = array(
				'data' => $value,
				'salt' => $salt,
			);
		}
		return wp_cache_set_multiple( $new_cache, $group, $expire );
	}
endif;

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