wp_die()

wp_die( string|WP_Error $message = '', string|int $title = '', string|array|int $args = array() ): never|void

function wp_die( $message = '', $title = '', $args = array() ) {
	global $wp_query;

	if ( is_int( $args ) ) {
		$args = array( 'response' => $args );
	} elseif ( is_int( $title ) ) {
		$args  = array( 'response' => $title );
		$title = '';
	}

	if ( wp_doing_ajax() ) {
		/**
		 * Filters the callback for killing WordPress execution for Ajax requests.
		 *
		 * @since 3.4.0
		 *
		 * @param callable $callback Callback function name.
		 */
		$callback = apply_filters( 'wp_die_ajax_handler', '_ajax_wp_die_handler' );
	} elseif ( wp_is_json_request() ) {
		/**
		 * Filters the callback for killing WordPress execution for JSON requests.
		 *
		 * @since 5.1.0
		 *
		 * @param callable $callback Callback function name.
		 */
		$callback = apply_filters( 'wp_die_json_handler', '_json_wp_die_handler' );
	} elseif ( wp_is_serving_rest_request() && wp_is_jsonp_request() ) {
		/**
		 * Filters the callback for killing WordPress execution for JSONP REST requests.
		 *
		 * @since 5.2.0
		 *
		 * @param callable $callback Callback function name.
		 */
		$callback = apply_filters( 'wp_die_jsonp_handler', '_jsonp_wp_die_handler' );
	} elseif ( defined( 'XMLRPC_REQUEST' ) && XMLRPC_REQUEST ) {
		/**
		 * Filters the callback for killing WordPress execution for XML-RPC requests.
		 *
		 * @since 3.4.0
		 *
		 * @param callable $callback Callback function name.
		 */
		$callback = apply_filters( 'wp_die_xmlrpc_handler', '_xmlrpc_wp_die_handler' );
	} elseif ( wp_is_xml_request()
		|| isset( $wp_query ) &&
			( function_exists( 'is_feed' ) && is_feed()
			|| function_exists( 'is_comment_feed' ) && is_comment_feed()
			|| function_exists( 'is_trackback' ) && is_trackback() ) ) {
		/**
		 * Filters the callback for killing WordPress execution for XML requests.
		 *
		 * @since 5.2.0
		 *
		 * @param callable $callback Callback function name.
		 */
		$callback = apply_filters( 'wp_die_xml_handler', '_xml_wp_die_handler' );
	} else {
		/**
		 * Filters the callback for killing WordPress execution for all non-Ajax, non-JSON, non-XML requests.
		 *
		 * @since 3.0.0
		 *
		 * @param callable $callback Callback function name.
		 */
		$callback = apply_filters( 'wp_die_handler', '_default_wp_die_handler' );
	}

	call_user_func( $callback, $message, $title, $args );
}