Finds registered post types from their originating location using debug_backtrace()

finding-registered-post-types.php

function my_registered_type( $post_type ) {
	if ( 'shop_order' !== $post_type ) {
		return;
	}

	$backtrace = debug_backtrace();
	$iterator = count( $backtrace ) - 1;

	if ( $iterator <= 0 ) {
		return;
	}

	$plugin_dir = WP_PLUGIN_DIR;
	$theme_dir = get_stylesheet_directory();
	$parent_dir = get_template_directory();

	// Okay we have the key, now walk backwards
	while ( $iterator > 0 ) {
		$cur_key = $backtrace[ $iterator ];
		if ( isset( $cur_key['file'] ) ) {
			if ( 0 === strpos( $cur_key['file'], $plugin_dir ) ){
				// This is a plugin
				error_log( __FUNCTION__ . '::' . __LINE__ );
				return;
			} elseif ( 0 === strpos( $cur_key['file'], $theme_dir ) ) {
				// This is a theme issue
				error_log( __FUNCTION__ . '::' . __LINE__ );
				return;
			} elseif ( 0 === strpos( $cur_key['file'], $parent_dir ) ) {
				// This is a parent theme issue
				error_log( __FUNCTION__ . '::' . __LINE__ );
				return;
			}
		}
		$iterator--;
	}
}
add_action( 'registered_post_type', 'my_registered_type' );