class User {
    public $name;
    public $age;
    public static $minPassLength = 6;

    public static function  validatePass($pass){
        if(strlen($pass) >= self::$minPassLength) { //self because it's static
            return true;
        } else {
            return false;

$password = 'hello';
if(User::validatePass($password)) {
    echo 'Password valid';

} else {
    echo 'Password not valid';
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