Alert: This function’s access is marked private. This means it is not intended for use by plugin or theme developers, only in other core functions. It is listed here for completeness.
_wp_filter_build_unique_id( string $hook_name, callable|string|array $callback, int $priority ): string
Builds a unique string ID for a hook callback function.
Description
Functions and static method callbacks are just returned as strings and shouldn’t have any speed penalty.
Parameters
-
$hook_namestring Required -
Unused. The name of the filter to build ID for.
-
$callbackcallable|string|array Required -
The callback to generate ID for. The callback may or may not exist.
-
$priorityint Required -
Unused. The order in which the functions associated with a particular action are executed.
Return
string Unique function ID for usage as array key.
Source
File: wp-includes/plugin.php.
View all references
function _wp_filter_build_unique_id( $hook_name, $callback, $priority ) {
if ( is_string( $callback ) ) {
return $callback;
}
if ( is_object( $callback ) ) {
// Closures are currently implemented as objects.
$callback = array( $callback, '' );
} else {
$callback = (array) $callback;
}
if ( is_object( $callback[0] ) ) {
// Object class calling.
return spl_object_hash( $callback[0] ) . $callback[1];
} elseif ( is_string( $callback[0] ) ) {
// Static calling.
return $callback[0] . '::' . $callback[1];
}
}
Changelog
| Version | Description |
|---|---|
| 5.3.0 | Removed workarounds for spl_object_hash().$hook_name and $priority are no longer used, and the function always returns a string. |
| 2.2.3 | Introduced. |