wp_trigger_error()

wp_trigger_error( string $function_name, string $message, int $error_level = E_USER_NOTICE )

function wp_trigger_error( $function_name, $message, $error_level = E_USER_NOTICE ) {
	/**
	 * Always fires when the given function triggers a user-level error/warning/notice/deprecation message.
	 *
	 * Can be used to attach custom error handlers even if WP_DEBUG is not truthy.
	 *
	 * @since 7.0.0
	 *
	 * @param string $function_name The function that triggered the error.
	 * @param string $message       The message explaining the error.
	 * @param int    $error_level   The designated error type for this error.
	 */
	do_action( 'wp_trigger_error_always_run', $function_name, $message, $error_level );

	/**
	 * Filters whether to trigger an error.
	 *
	 * @since 7.0.0
	 *
	 * @param bool   $trigger       Whether to trigger the error. Default true.
	 * @param string $function_name The function that triggered the error.
	 * @param string $message       The message explaining the error.
	 * @param int    $error_level   The designated error type for this error.
	 */
	if ( ! apply_filters( 'wp_trigger_error_trigger_error', true, $function_name, $message, $error_level ) ) {
		return;
	}

	// Bail out if WP_DEBUG is not turned on.
	if ( ! WP_DEBUG ) {
		return;
	}

	/**
	 * Fires when the given function triggers a user-level error/warning/notice/deprecation message.
	 *
	 * Can be used for debug backtracking.
	 *
	 * @since 6.4.0
	 *
	 * @param string $function_name The function that triggered the error.
	 * @param string $message       The message explaining the error.
	 * @param int    $error_level   The designated error type for this error.
	 */
	do_action( 'wp_trigger_error_run', $function_name, $message, $error_level );

	if ( ! empty( $function_name ) ) {
		$message = sprintf( '%s(): %s', $function_name, $message );
	}

	$message = wp_kses(
		$message,
		array(
			'a'      => array( 'href' => true ),
			'br'     => array(),
			'code'   => array(),
			'em'     => array(),
			'strong' => array(),
		),
		array( 'http', 'https' )
	);

	if ( E_USER_ERROR === $error_level ) {
		throw new WP_Exception( $message );
	}

	trigger_error( $message, $error_level );
}