坦率地说，是print和print_r()的组合，以打印出变量。我知道很多人更喜欢使用其他更高级的方法，但我发现这是最容易使用的。

我要说的是，直到我在Uni做了一些微处理器编程，甚至都不会使用它，我才完全理解这一点。

我使用Netbeans的XDebug和Easy XDebug FireFox插件

The add-on is essential when you debug MVC projects, because the normal way XDebug runs in Netbeans is to register the dbug session via the url. With the add-on installed in FireFox, you would set your Netbeans project properties -> Run Configuratuion -> Advanced and select "Do Not Open Web Browser" You can now set your break points and start the debugging session with Ctrl-F5 as usual. Open FireFox and right-click the Add-on icon in the right bottom corner to start monitoring for breakpoints. When the code reaches the breakpoint it will stop and you can inspect your variable states and call-stack.

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.

集成的调试器，可以在逐步执行代码时观察变量值的变化，这真的很酷。但是，它们确实需要在服务器上安装软件，并在客户机上进行一定数量的配置。两者都需要定期维护以保持良好的工作状态。

print_r易于编写，并保证在任何设置中都能工作。

在某种程度上，这取决于事情的走向。这是我尝试分离的第一件事，然后在必要时使用echo/print_r()。

注:你们知道你可以把true作为第二个参数传递给print_r()，它会返回输出而不是打印它吗?例如:

echo "<pre>".print_r($var, true)."</pre>";

Xdebug和用于notepad++的DBGp插件用于繁重的bug查找，FirePHP用于轻量级的东西。又快又脏?没有什么比dBug更好的了。