登录类返回bol（false）

Question

I have the fallowing class that I have written for a login application using this tutorial :

class passHash{

    private static $algo='$2y$';
    private static $cost ='12$';

    private function generateSalt(){
       $salt=substr(sha1(mt_rand()),0,22);
       return $salt;
    }

    public function hashPassword($password){
       $hashpassword=crypt($password,self::$algo.self::$cost.self::generateSalt());
       return $hashpassword;
    }

    public function checkPassword($hash, $password){
        $fullsalt=substr($hash,0,29);
        $newhash=crypt($password,$fullsalt);

        if ($newhash==$password){
           return true;
        }else{
           return false;
       }

   }
}

I think the code is self explanatory and i saw that there are a lot of questions regarding this login class.
Now the problem that i have encountered is with checking the password. If I do something like:

$a=passHash::hashPassword('1234');

$b=passHash::checkPassword($a,'1234');
var_dump($b);

I gate the result of bool(false)

Where is the problem with this code ?

---

EDIT 1 if I modifay the checkPassword like this:

public function checkPassword($hash, $password){
    $fullsalt=substr($hash,0,29);
    $newhash=crypt($password,$fullsalt).'<br>';
    return $newhash;
}

and then i do :

$a=passHash::hashPassword('1234');
echo 'hashPassword: '.$a.'<br>';

$b=passHash::checkPassword($a,'1234');
echo 'checkPassword: '.$b.'<br>';

i get
hashPassword:$2y$12$6e29c2bbdacad854b1a63O8aty2a/.MQN0wbdmClnhXMbH3/tfQfG
checkPassword: $2y$12$6e29c2bbdacad854b1a63O8aty2a/.MQN0wbdmClnhXMbH3/tfQfG

they are identical .. so where is the problem ?

Answer 1

The test should be this:

    if ($newhash==$hash){
       return true;
    }else{
       return false;
   }