为啥PHP不能接收。

为什么PHP不能接收。。

 $.ajax({<br />
       type: "POST",<br />
        url: "index.php",<br />
        data: "location=img_png_src",<br />
        success: function(msg){<br />
         alert( "Data Saved: " + msg );<br />
           }<br />
      });<br />

<?php echo $_POST["location"]; ?>

PHP接受不了 报错了 Notice: Undefined index: location in C:\wamp\www\makebanner\index.php on line 45

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------解决方案--------------------

<?php<br />
if($_SERVER['REQUEST_METHOD'] == "POST") {<br />
  print_r($_POST);<br />
  exit();<br />
}<br />
?><br />
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.3/jquery.min.js"></script><br />
<script><br />
$(function() {<br />
 $.ajax({<br />
       type: "POST",<br />
//        url: "index.php",<br />
        data: "location=img_png_src",<br />
        success: function(msg){<br />
         alert( "Data Saved: " + msg );<br />
           }<br />
      });<br />
});<br />
</script><br />