php function that generate a random string

randomStr

function randomStr($lenght){
	$str = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ123456789';
	$str = str_shuffle($str);
	while (strlen($str) < $lenght) {
		$str = $str.randomStr($lenght - strlen($str));
	}
    
  return substr($str, strlen($str) - $lenght);
}