Не могу найти ошибку в php коде. Отблагодарю лайком

Ошибка

Parse error: syntax error, unexpected '(', expecting variable (T_VARIABLE) or '{' or '$' in /var/www/u1244595/data/www/test.ru/test.php on line 2

Код

<?php
$('form').submit(function(){
var required = $[required="true"]; // change to [required] if not using true option as part of the attribute as it is not really needed.
var error = false;

for(var i = 0; i <= (required.length - 1);i++)
{
if(required[i].value == '') // tests that each required value does not equal blank, you could put in more stringent checks here if you wish.
{
required[i].style.backgroundColor = 'rgb(255,155,155)';
error = true; // if any inputs fail validation then the error variable will be set to true;
}
}

if(error) // if error is true;
{
return false; // stop the form from being submitted.
}
});
?>