zend studio 5.2 调试输出html不能显示图片

复制内容到剪贴板

代码:

<?php
/*
  *   Filename:    image.php
  *   Author:   PHP-Fish
  *   Date:   2007-01-27
  *   CopyRight:   PHP-Fish.com
*/
header("content-type: image/png");
srand((double)microtime()*100000);

$im = imagecreate(60,25);
$black = imagecolorallocate($im,0,0,0);
$white = imagecolorallocate($im,255,255,255);
$gray = imagecolorallocate($im,200,200,200);

imagefill($im,60,25,$gray);
imagestring($im,8,12,6,$HTTP_GET_VARS['randnum'],$white);
for($i=0;$i<100;$i++)
{
        $randcolor = imagecolorallocate($im,rand(0,255),rand(0,255),rand(0,255));
        imagesetpixel($im,rand()%70,rand()%30,$randcolor);
}
imagepng($im);
imagedestroy($im);
?>

复制内容到剪贴板

代码:

<?php
/*
  *   Filename:    main.php
  *   Author:   PHP-Fish
  *   Date:   2007-01-27
  *   CopyRight:   PHP-Fish.com
*/
srand((double)microtime()*1000000);
if(isset($HTTP_POST_VARS['num']))
{
        if(strcmp($HTTP_POST_VARS['randnum'],$HTTP_POST_VARS['num'])==0)
        echo "验证成功！";
        else
        echo "验证失败!";
}
while(($randnum=rand()%10000)<1000);
//echo $randnum;
?>
<form action=main.php method="post">
请输入您的验证码:<input name="num" type="text"><br>
<input type="submit" value="提交">
<input type="hidden" name="randnum" value=<?php echo $randnum;?>>
<img src=image.php?randnum=<?php echo $randnum;?>>

</form>