- %1$s is private and should not be used in themes or plugins directly.
_get_plugin_from_callback ( $callback )
- (callable) $callback The callback function to check.
- (array|null) The plugin that the callback belongs to, or null if it doesn't belong to a plugin.
- Introduced in WordPress: 5.0.0
- Deprecated in WordPress: —
Internal helper function to find the plugin from a meta box callback.