PHP: List of Reserved Words - Manual

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Predefined Variables Список псевдонимов функций

Last updated: Sat, 27 Jan 2007

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# Приложение K. List of Reserved Words

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.

# 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, function or method names. Using them as variable names is generally OK, but could lead to confusion.

Таблица K-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 (PHP 5) | php_user_filter (PHP 5)
interface (PHP 5) | implements (PHP 5) | extends | public (PHP 5) | private (PHP 5)
protected (PHP 5) | abstract (PHP 5) | clone (PHP 5) | try (PHP 5) | catch (PHP 5)
throw (PHP 5) | cfunction (PHP 4 only) | old_function (PHP 4 only) | this (PHP 5 only) |

add a note User Contributed Notes
List of Reserved Words
londonx at gmail dot com
05-Mar-2007 02:14
`Naming a PHP5 class "variant" (with a constructor called the same) and then making an instance of it using __autoload triggers an error which disappears as soon as the name is changed. This should mean that "variant" is also a reserved word.`
01-Nov-2006 04:42
`Two things:
1. It would be nice for this list to differentiate those reserved words, which are language constructs used *with* parentheses (isset, unset, empty, eval, exit, die, ...) and those rather to be used *without* parentheses (all includes, echo, print, return, ...?)
This would really help define some common coding styles...
2. Do you write NULL, TRUE, FALSE or null, true, false? (I find CAPITAL letters better, however typing them can be annoying so I stick with using all lowercase letters, but what's the standard?)`
al dot barrett at gmail dot com
04-May-2006 09:38
`The list also seems to be missing both "parent" and "self" as well.`
wsapplegate at IHATESPAM dot myrealbox dot com
31-Jan-2006 09:32
`I also can't find the NULL keyword in the list. The `extends' keyword is mentioned twice, too.`
10-Jan-2006 03:41
`I don't see the boolean constants 'true' and 'false' listed among the reserved words/keywords/constants.`
add a note
Predefined Variables Список псевдонимов функций

Last updated: Sat, 27 Jan 2007
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