验证码和标头有问题 (PHP)

发布于 2024-08-04 14:20:54 字数 967 浏览 1 评论 0原文

我正在尝试向其他人制作的网站添加验证码。我一直在关注这个教程，如果我将其放在单独的文件中，它就可以正常工作（因此这不是服务器设置的问题）

但是，当我尝试将其添加到现有页面时，它根本不起作用。当我在 Internet Explorer 中加载页面时，源代码在应该显示图像的地方显示随机字符，例如：

‰PNGIHDRé1°8ö[IDATxœÍ]kp×u>»X‹± (4  ›–9¦:‰-C£V™©4–[ÓL•4“Dm~„njR3ª]*qÒÚ‰£ŽãD–&~Ô±ØØŽ$

在 Firefox 中，我收到消息：无法显示图像“myurl”，因为它包含错误。

我假设这与标题有关，但我不太确定。

这是我用来创建图像的代码：

$md5 = md5(microtime() * mktime());
$string = substr($md5,0,5);
$captcha = imagecreatefrompng("./captcha.png");
$black = imagecolorallocate($captcha, 0, 0, 0);
$line = imagecolorallocate($captcha,233,239,239);
imageline($captcha,0,0,39,29,$line);
imageline($captcha,40,0,64,29,$line);
imagestring($captcha, 5, 20, 10, $string, $black);
$_SESSION['key'] = md5($string);
header("Content-type: image/png");
imagepng($captcha);

任何建议将不胜感激。谢谢。

原文

I'm trying to add a captcha to a site somebody else has made.
I've been following this tutorial and if I make it in a separate file, it works just fine (so it's not an issue with the server setup)

However, when I try to add it to an existing page, it's not working at all. When I load the page in Internet Explorer, the source code is displayed with random characters where the image should have been displayed such as:

‰PNGIHDRé1°8ö[IDATxœÍ]kp×u>»X‹± (4  ›–9¦:‰-C£V™©4–[ÓL•4“Dm~„njR3ª]*qÒÚ‰£ŽãD–&~Ô±ØØŽ$

In Firefox, I get the message: The image “myurl” cannot be displayed, because it contains errors.

I'm assuming this is something to do with the headers, but I'm not really sure.

This is the code I'm using to create the image:

$md5 = md5(microtime() * mktime());
$string = substr($md5,0,5);
$captcha = imagecreatefrompng("./captcha.png");
$black = imagecolorallocate($captcha, 0, 0, 0);
$line = imagecolorallocate($captcha,233,239,239);
imageline($captcha,0,0,39,29,$line);
imageline($captcha,40,0,64,29,$line);
imagestring($captcha, 5, 20, 10, $string, $black);
$_SESSION['key'] = md5($string);
header("Content-type: image/png");
imagepng($captcha);

Any advice would be greatly appreciated. Thanks.

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