Question

我有两个课程如下：

class-1：connection_class.php

class connection{
public $connection;

function __construct(){
  $this->db_connect();
}

private function db_connect(){
  $this->conn = @ new mysqli('localhost', 'username', 'password');
     if ($this->connection->connect_error) {
       $this->connection = FALSE;
       $this->warn = '<br />Failed to connect database! Please try again later';
     }
}

}

和一个loginclass： class-2：login_class.php

class login{
private $conn;
    function __construct($con){
      if($con->connection==FALSE){
         echo $con->warn;
         exit();
      }else{
         $this->conn=$con->connection;
      }
   }

public function get_user($sql){
  $this->db_select('database_name');
  $result = $this->conn->query($logopt['sql']);
      if($result->num_rows>=1){
          return $result;
      }else{
          return FALSE;
      }
}
}

现在从登录页面：页面：login.php

include_once('connection_class.php');
$con = new connection();

include_once('login_class.php');
$login = new login($con);

$sql= "SELECT * FROM access WHERE username='".real_escape_string($user_name)."' AND password='".$pass_word."'";
$user=$login->getuser($sql);
if($user){
   echo 'User found';
}else{
   echo 'User not found';
}

此处如果我使用real_escape_string（$ user_name）或mysqli_real_escape_string（$ user_name），则login.php显示以下错误：

致命错误：调用未定义的函数real_escape_string（） ...........

如何在我的情况下使用real_escape_string？

Answer 1

由于您将mysqli连接包装在另一个类中，因此需要在连接类中公开调用real_escape_string的方法。

例如：

class connection{
  public $connection;

  function __construct(){
    $this->db_connect();
  }

  private function db_connect(){
    $this->conn = @ new mysqli('localhost', 'username', 'password');
    if ($this->connection->connect_error) {
      $this->connection = FALSE;
      $this->warn = '<br />Failed to connect database! Please try again later';
    }
  }

  public function real_escape_string($string) {
    // todo: make sure your connection is active etc.
    return $this->conn->real_escape_string($string);
  }
}

然后，改变

$sql= "SELECT * FROM access WHERE username='".real_escape_string($user_name)."' AND password='".$pass_word."'";

到

$sql= "SELECT * FROM access WHERE username='".$con->real_escape_string($user_name)."' AND password='".$pass_word."'";

额外评论：您的login课程实际上并未使用您的连接来运行查询。你需要解决这个问题（特别是：$this->db_select('database_name');）。

Answer 2

您忘记在函数开头添加msql_正确的函数mysql_real_escape_string();如上所述使用此代替real_escape_string();。

希望这能解决您的问题。

real_escape_string不适用于php oop

2 个答案: