Login with PHP using crypt()

crypt.php

<?php
  define($hash_token,"$%&123");//$hash_token is the key to use in crypt()

 public function crypt_password($password){
   
  return $encripted_password = crypt($password,$hash_token);
  
 }
 
 public function login($user_name, $dumb_password){
  
   $encripted_password = crypt($dumb_password, $hash_token);
   $user = this->get_user_by_name($user_name);
   
   /*being get_user_by_name a SQL function which queries
    *SELECT * FROM User WHERE user_name = $user_name
   */
  
   if(strcmp($user['password'], $encripted_password,) == 0){
     return $user;
   }else{
     return NULL;
   }
 }
?>