validate string

validate.php

<?php

    public static function string(&$value, $display, $min, $max, $required=false)
    {
      $lang = lang :: get("validate");
      $value = trim(strip_tags($value));
      $len = strlen($value);
      
      if($len == 0)
        if(!$required) 
            return true;
        else
          return "$display ".'is required'; // $lang->v1;
      
      if(($len < $min) || ($len > $max))
        return "$display ".'must be between '. $min .' and '. $max . $lang->stringMsg; //$lang->v2 .. $lang->v3
    //  $display must be between [number] and [number]
      return true;
    }