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Keywords in PHP

A keyword is a word reserved by the language for its core functionality—you cannot give a variable, function, class, or constant the same name as a keyword. Lists of keywords in PHP, which are case-insensitive.
and $argc $argv as
break case cfunction class
continue declare default die
do E_ALL echo E_ERROR
else elseif empty enddeclare
endfor endforeach endif endswitch
E_PARSE eval E_WARNING exit
extends FALSE for foreach
function $HTTP_COOKIE_VARS $HTTP_ENV_VARS $HTTP_GET_VARS
$HTTP_POST_FILES $HTTP_POST_VARS $HTTP_SERVER_VARS if
include include_once global list
new not NULL old_function
or parent PHP_OS $PHP_SELF
PHP_VERSION print require require_once
return static stdClass switch
$this TRUE var virtual
while xor _ _FILE_ _ _ _LINE_ _
_ _sleep _ _wakeup $_COOKIE $_ENV
$_FILES $_GET $_POST $_SERVER

In addition, you cannot use an identifier that is the same as a built-in PHP function.

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