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用thinkphp写的用户登录界面，但是历次都说用户名或者密码不正确，求解

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2016-06-13 12:40:401017browse

用thinkphp写的用户登录界面，但是每次都说用户名或者密码不正确，求解？

<?php<br />
session_start();<br />
header('Content-Type:text/html; charset=utf-8');<br />
class AdminAction extends Action{<br />
      public function index(){<br />
	  if(isset($_POST['username'])){<br />
	        if(isset($_POST['username'])&&isset($_POST['password'])){<br />
			    $db=M();<br />
				$select=$db->query("select * from developers where username=".$POST['username']." and password=".$_POST['password']."");<br />
				if($select){<br />
				    $_SESSION['admin']=$_POST['username'];<br />
					$this->redirect('Index/index','',2,'用户'.$_POST['username'].'登录成功！');<br />
                 }else{<br />
					$this->redirect('Index/index','',2,'用户名或者密码不正确');<br />
					}<br />
				}else{<br />
				    $this->redirect('Index/index','',2,'用户名或密码不能为空！');<br />
					}<br />
					}<br />
					$this->display();<br />
					}<br />
	}<br />
	?>

我不填提示我用户名或者密码不正确，我填正确了也提示我用户名或者密码不正确，不知道哪的问题，求解答。

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