在PHP中，有没有办法跟踪变量？

Question

I have this variable in a big php script that I want to trace back to where/when and what value it was instantiated. Is there a function/api or debugging techniques to do this?

Answer 1

If you're using PHPStorm you can set breakpoints and inspect the values of variables.

http://blog.jetbrains.com/phpstorm/2013/12/just-in-time-debugging-and-php-exception-breakpoints-with-phpstorm-and-xdebug/

You'll need xdebug installed as well.