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<?php class WP_REST_Global_Styles_Controller { public function update_item() { echo "\n" . __METHOD__ . "\n"; $this->prepare_item_for_database(); } protected function prepare_item_for_database() { echo "\n" . __METHOD__ . "\n"; $this->validate_custom_css(); } private function validate_custom_css() { echo __METHOD__ . "()\n"; } } class WP_REST_Global_Styles_Controller_X_X extends WP_REST_Global_Styles_Controller { public function update_item() { echo "\n" . __METHOD__ . "\n"; // some custom code. $this->prepare_item_for_database(); } /** * Want to invoke this method, not the parent's method. */ protected function validate_custom_css() { echo __METHOD__ . "()\n"; } } ( new WP_REST_Global_Styles_Controller_X_X() )->update_item();