如何打印调试日志? [英] How to print a debug log?

问题描述

我想调试一些PHP代码，但是我想将日志打印到屏幕或文件上对我来说很好.

I'd like to debug some PHP code, but I guess printing a log to screen or file is fine for me.

如何打印PHP代码中的日志?

通常的print/printf似乎是HTML输出而不是控制台输出.

The usual print/printf seems to go to HTML output not the console.

我让Apache服务器执行PHP代码.

I have Apache server executing the PHP code.

推荐答案

一个鲜为人知的技巧是mod_php将stderr映射到Apache日志.并且，有一个流，因此file_put_contents('php://stderr', print_r($foo, TRUE))会很好地将$foo的值转储到Apache错误日志中.

A lesser known trick is that mod_php maps stderr to the Apache log. And, there is a stream for that, so file_put_contents('php://stderr', print_r($foo, TRUE)) will nicely dump the value of $foo into the Apache error log.

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