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Can I use it as a method name in my classes?
It appears to be a function: http://www.php.net/manual/en/ref.misc.php
But I see there listed some language constructs too, like die and exit.
When you can… you can, when you can’t… you’ll know 🙂
See a list of reserved words here http://php.net/manual/en/reserved.php and avoid them. Any good PHP IDE will warn you when you attempt to illegal-name your methods.
There’s another issue. If you forget $this->Method() and you just use Method() in your class, it will work as it’s defined as a function. This will lead to freak and hard to find bugs.