XDebug对于开发至关重要。我安装它之前任何其他扩展。它为您提供任何错误的堆栈跟踪，您可以轻松地启用分析。

使用var_dump()可以快速查看数据结构。不要使用print_r()，因为你必须用<pre>包围它，而且它一次只打印一个var。

<?php var_dump(__FILE__, __LINE__, $_REQUEST); ?>

对于一个真正的调试环境，我发现最好的是Komodo IDE，但它要花费$$。

For the really gritty problems that would be too time consuming to use print_r/echo to figure out I use my IDE's (PhpEd) debugging feature. Unlike other IDEs I've used, PhpEd requires pretty much no setup. the only reason I don't use it for any problems I encounter is that it's painfully slow. I'm not sure that slowness is specific to PhpEd or any php debugger. PhpEd is not free but I believe it uses one of the open-source debuggers (like XDebug previously mentioned) anyway. The benefit with PhpEd, again, is that it requires no setup which I have found really pretty tedious in the past.

Nusphere也是一个很好的php调试器 nusphere

我使用了Zend Studio(5.5)和Zend平台。这就提供了适当的调试、断点/跨代码等，尽管是有代价的。

我使用Netbeans和XDebug。 在它的网站上查看如何配置它的文档。 http://php.netbeans.org/

Print_r (debug_backtrace());

或者类似的东西:-)