Cache API: Add a warning when calling _get_non_cached_ids with invalid ids.

Sanitize the array of ids passed to the `_get_non_cached_ids` function and add a `_doing_it_wrong` call, if an invalid type is passed. 

Props tillkruess, spacedmonkey, peterwilsoncc, flixos90, SergeyBiryukov.
Fixes #57593.

git-svn-id: https://develop.svn.wordpress.org/trunk@55543 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/functions.php

@@ -7014,6 +7014,13 @@ function wp_debug_backtrace_summary( $ignore_class = null, $skip_frames = 0, $pr
  * @return int[] Array of IDs not present in the cache.
  */
 function _get_non_cached_ids( $object_ids, $cache_key ) {
+	$object_ids = array_filter( $object_ids, '_validate_cache_id' );
+	$object_ids = array_unique( array_map( 'intval', $object_ids ), SORT_NUMERIC );
+
+	if ( empty( $object_ids ) ) {
+		return array();
+	}
+
 	$non_cached_ids = array();
 	$cache_values   = wp_cache_get_multiple( $object_ids, $cache_key );
 
@@ -7026,6 +7033,30 @@ function _get_non_cached_ids( $object_ids, $cache_key ) {
 	return $non_cached_ids;
 }
 
+/**
+ * Checks whether the given cache ID is either an integer or iterger-like strings.
+ * Both `16` and `"16"` are considered valid, other numeric types and numeric
+ * strings (`16.3` and `"16.3"`) are considered invalid.
+ *
+ * @since 6.3.0
+ *
+ * @param mixed $object_id The cache id to validate.
+ * @return bool Whether the given $object_id is a valid cache id.
+ */
+function _validate_cache_id( $object_id ) {
+	// Unfortunately filter_var() is considered an optional extension
+	if ( is_int( $object_id )
+		|| ( is_string( $object_id ) && (string) (int) $object_id === $object_id ) ) {
+		return true;
+	}
+
+	/* translators: %s: The type of the given object id. */
+	$message = sprintf( __( 'Object id must be integer, %s given.' ), gettype( $object_id ) );
+	_doing_it_wrong( '_get_non_cached_ids', $message, '6.3.0' );
+
+	return false;
+}
+
 /**
  * Tests if the current device has the capability to upload files.
  *