为什么PHP仍然显示我的方法为Undefined？

我试图保存用户到数据库，似乎一切都很好，除了一个问题为什么PHP仍然显示我的方法为Undefined？

为什么每次我打电话save_user（......）我得到

Fatal error: Call to undefined function check_user() in ... on line 47

连接类：

class Db_connect { 

    function __construct(){ 

    } 
    function __destruct(){ 

    } 
    function connect(){ 
     $connect = MySQL_Connect ("host", "user", "pass") or Die("Couldn't connect to DB"); 
     MySQL_Select_Db("db") or Die("Couldn't find database db"); 
     mysql_query("SET NAMES 'utf-8'"); 

     return $conect; 
    } 
    function close(){ 
     MySQL_close(); 
    } 

}

功能类

class Db_functions { 
    private $db; 

    function __construct(){ 
     $this->db = new Db_connect(); 
     $this->db->connect(); 
    } 
    function __destruct(){ 

    } 

    public function check_user($email,$pass){ 
     $result = "SELECT email FROM user WHERE email='$email' AND pass='$pass'"; 
     $sql = mysql_query($result); 

     if (mysql_num_rows($sql) > 0) { 
      return true; 
     } 
     return false; 
    } 

    public function save_user($id,$name,$pass,$email,$country){ 
     $result = "INSERT INTO user(id,name,pass,email,country) VALUES('$id','$name','$pass','$email','$country')"; 

     if (check_user($email,$pass)) { //here's line 47 
      return false; 
     } 
     if (mysql_query($result)) { 
      return true; 
     } 
     return false; 
    } 
}

我GET婷真的很累：DI找不到什么不对

来源

2014-04-27 Michal Heneš

你有你的连接功能'$回报瞬移一个错字;'应该是'$返回连接;' –

感谢的。那将是另一个问题：D –