fi_Functions.php

<?php

/*
	json_last_error_msg requires php >= 5.5.0 see http://php.net/manual/en/function.json-last-error-msg.php
	a possible fix would be:
*/

if (!function_exists('json_last_error_msg'))
{
	function json_last_error_msg()
	{
		switch (json_last_error()) {
			default:
				return;
			case JSON_ERROR_DEPTH:
				$error = 'Maximum stack depth exceeded';
			break;
			case JSON_ERROR_STATE_MISMATCH:
				$error = 'Underflow or the modes mismatch';
			break;
			case JSON_ERROR_CTRL_CHAR:
				$error = 'Unexpected control character found';
			break;
			case JSON_ERROR_SYNTAX:
				$error = 'Syntax error, malformed JSON';
			break;
			case JSON_ERROR_UTF8:
				$error = 'Malformed UTF-8 characters, possibly incorrectly encoded';
			break;
		}
		return $error;
	}
}