如何检测是否有任何输出？如果有，如何重定向？ [英] How can I detect if any output has been written? And how can I redirect if it has?

问题描述

假设我想要一些通用的错误处理，可以从所有的调用...

理想情况下，我想直接回到错误页面使用标头（'Location：... ，但是当然，如​​果有任何输出被写入，我不能这样做，所以...

1）如何检测是否有任何输出？

2）如果有新页面，我可以如何加载？

也许我应该缓冲整个页面，只有输出它，一旦我确定它是完整的，没有更多的错误可以发生。

解决方案

使用PHP的内置输出缓冲。在最简单的情况下，您只需要调用 ob_start（），然后才能产生输出。

是您可以利用的其他选项，如果您愿意的话：

http://www.php.net/manual/en/function.ob-start.php

Let's say that I want some generic error handling, which can be called from all over...

Ideally, I would like to just readirect to an error page using header('Location:... but, of course I can't do that it if any output has been written, so ...

1) how can I detect if any output has been written?
2) how can I load a new page if it has?

Perhaps I should buffer the entire page and only output it once I am certain that it is complete and no more errors can occur?

解决方案

Use PHP's built-in output buffering. At it's simplest, all you need to do is call ob_start() before anything that would produce output.

There are other options you can take advantage of as well if you desire:

http://www.php.net/manual/en/function.ob-start.php

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