php缩略图的问题
以下是我的代码：

1.<?php
2.$ef='index\images\m_1307414811439.jpg';
3.$bs="<img src='$ef'>";
4.$rr=getimagesize($ef);
5.$new=imagecreatetruecolor(300,300);
6.imagecopyresized($new,$bs,0,0,0,0,300,300,$rr[0],$rr[1]);
7.header("content-type:image/jpeg");
8.imagejpeg($new);
9.?>

出现的问题是6,7行报错，还有乱码

Warning: imagecopyresized(): supplied argument is not a valid Image resource in D:\PHP\r.php on line 6

Warning: Cannot modify header information - headers already sent by (output started at D:\PHP\r.php:6) in D:\PHP\r.php on line 7
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"

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------解决方案--------------------
imagecopyresized函数的前两个参数要求是图形对象变量，不是文件名路径字符串之类的东西，你第2个参数传的是$bs，然而你前面把它赋值为字符串内容，所以出错
我随便修了下代码，你看着思考吧


$ef='1.jpg';
$bs=imagecreatefromjpeg($ef);
$rr=getimagesize($ef);
$new=imagecreatetruecolor(300,300);
imagecopyresized($new,$bs,0,0,0,0,300,300,$rr[0],$rr[1]);
header("content-type:image/jpeg");
imagejpeg($new);