variables in php

variables in php must start with _ or any alphabet but can contain number in it. but we can use curly braces to hold a variable that starts with a numeric characters. lets see a zend mock question for php 5 certification preparation.

Question : Which of the following are valid PHP variables?

Answer:

1. @$foo
2. &$variable
3. ${0x0}
4. $variable
5. $0x0
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