PHP Manual
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Appendix H. List of Reserved Words

Table of Contents
List of Keywords
Predefined Variables
Predefined Classes
Predefined Constants

The following is a listing of predefined identifiers in PHP. None of the identifiers listed here should be used as identifiers in a your scripts. These lists include keywords and predefined variable, constant, and class names. These lists are neither exhaustive or complete.

List of Keywords

These words have special meaning in PHP. Some of them represent things which look like functions, some look like constants, and so on--but they're not, really: they are language constructs. You cannot use any of the following words as constants, class names, or function names. Using them as variable names is generally OK, but could lead to confusion.

Table H-1. PHP Keywords

and or xor __FILE__ exception php_user_filter
__LINE__ array() as break case
cfunction class const continue declare
default die() do echo() else
elseif empty() enddeclare endfor endforeach
endif endswitch endwhile eval() exit()
extends for foreach function global
if include() include_once() isset() list()
new old_function print() require() require_once()
return() static switch unset() use
var while __FUNCTION__ __CLASS__ __METHOD__
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