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Appendix M. List of Reserved Words
Table of Contents
- List of Keywords
- Predefined Variables
- Server variables:
$_SERVER - Environment variables:
$_ENV - HTTP Cookies:
$_COOKIE - HTTP GET variables:
$_GET - HTTP POST variables:
$_POST - HTTP File upload variables:
$_FILES - Request variables:
$_REQUEST - Session variables:
$_SESSION - Global variables:
$GLOBALS - The previous error message:
$php_errormsg - Raw POST data:
$HTTP_RAW_POST_DATA - HTTP response headers:
$http_response_header
- Server 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 any of your scripts. These lists include keywords and predefined variable, constant, and class names. These lists are neither exhaustive or complete.
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, function or method names. Using them as variable names is generally OK, but could lead to confusion.
Table M.1. PHP Keywords
| and | or | xor | __FILE__ | exception (PHP 5) |
| __LINE__ | array() | as | break | case |
| 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 |
| print() | require() | require_once() | return() | static |
| switch | unset() | use | var | while |
| __FUNCTION__ | __CLASS__ | __METHOD__ | final (as of PHP 5) | php_user_filter (as of PHP 5) |
| interface (as of PHP 5) | implements (as of PHP 5) | extends | public (as of PHP 5) | private (as of PHP 5) |
| protected (as of PHP 5) | abstract (as of PHP 5) | clone (as of PHP 5) | try (as of PHP 5) | catch (as of PHP 5) |
| throw (as of PHP 5) | cfunction (PHP 4 only) | old_function (PHP 4 only) | this (as of PHP 5) | namespace (PHP 6 only) |
| import (PHP 6 only) | goto (PHP 6 only) |