如何在PHP中捕获imagick致命错误 [英] How do I catch an imagick fatal error in PHP

问题描述

我正在使用imagick为pdf文档创建缩略图.我在这条线上收到致命错误.

i am using imagick to create thumbnails for pdf documents. i get a fatal error on this line..

$imagick->readImage($file .'[0]');

我尝试用try catch进行换行，但据我所知这是行不通的，因为这是一个致命错误，不是一个例外.我将如何优雅地捕获此错误?

I tried wrapping in a try catch but as i learned that doesn't work because it's a fatal error, not an exception. How would I gracefully catch this error?

与解决imagick问题相比，我更关心使用PHP检测错误，因为用户pdf文件可能会出现许多错误.谢谢！

I am more concerned about using PHP to detect the error than solving the imagick problem, since any number of errors might come up with user pdf files. thanks!

推荐答案

不幸的是，不可能在php中捕获致命错误.这是给定的.您仍然可以做几件事:

Unfortunately it's not possible to catch fatal errors in php. This is given. There are still couple of things you can do:

1. 使用register_shutdown_function()注册的功能仍将执行.您可以将错误处理放入该函数中，如果readImage()成功，则注册空函数.

1. Function registered using register_shutdown_function() is still executed. You can put your error hadling into such function, and if the readImage() succeeds, register empty function.

您可以将缩略图生成放入php命令行脚本并使用exec('php thngenerate.php ' . escapeshellarg($file .'[0]'), $out, $return_var);执行.如果是$return_var != 0，则出现错误.

You can put thumbnail generation into php command line script and execute it using exec('php thngenerate.php ' . escapeshellarg($file .'[0]'), $out, $return_var);. If $return_var != 0, there was an error.

类似于#2，但是使用http调用脚本，这次您注意内部服务器错误.

Similar to #2, but script is called using http, this time you watch for internal server error.

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