wp-includes/functions.php:7279Checks whether the given cache ID is either an integer or an integer-like string.
$object_idmixedboolfunction _validate_cache_id( $object_id ) { /* * filter_var() could be used here, but the `filter` PHP extension * is considered optional and may not be available. */ 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 an integer, %s given.' ), gettype( $object_id ) ); _doing_it_wrong( '_get_non_cached_ids', $message, '6.3.0' ); return false;}Introduced in 6.3.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/functions.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.