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.

PHP Keywords
__halt_compiler() abstract and array() as
break callable (as of PHP 5.4) case catch class
clone const continue declare default
die() do echo else elseif
empty() enddeclare endfor endforeach endif
endswitch endwhile eval() exit() extends
final finally (as of PHP 5.5) for foreach function
global goto (as of PHP 5.3) if implements include
include_once instanceof insteadof (as of PHP 5.4) interface isset()
list() namespace (as of PHP 5.3) new or print
private protected public require require_once
return static switch throw trait (as of PHP 5.4)
try unset() use var while
xor yield (as of PHP 5.5)
Compile-time constants
__CLASS__ __DIR__ (as of PHP 5.3) __FILE__ __FUNCTION__ __LINE__ __METHOD__
__NAMESPACE__ (as of PHP 5.3) __TRAIT__ (as of PHP 5.4)

Коментарии

Автор:
Here they are as arrays:

<?php
$keywords 
= array('__halt_compiler''abstract''and''array''as''break''callable''case''catch''class''clone''const''continue''declare''default''die''do''echo''else''elseif''empty''enddeclare''endfor''endforeach''endif''endswitch''endwhile''eval''exit''extends''final''for''foreach''function''global''goto''if''implements''include''include_once''instanceof''insteadof''interface''isset''list''namespace''new''or''print''private''protected''public''require''require_once''return''static''switch''throw''trait''try''unset''use''var''while''xor');

$predefined_constants = array('__CLASS__''__DIR__''__FILE__''__FUNCTION__''__LINE__''__METHOD__''__NAMESPACE__''__TRAIT__');
?>

Along with get_defined_functions() and get_defined_constants(), this can be useful for checking eval() statements.
2012-10-04 19:33:07
http://php5.kiev.ua/manual/ru/reserved.keywords.html
RegEx to find all the keywords:

\b(
(a(bstract|nd|rray|s))|
(c(a(llable|se|tch)|l(ass|one)|on(st|tinue)))|
(d(e(clare|fault)|ie|o))|
(e(cho|lse(if)?|mpty|nd(declare|for(each)?|if|switch|while)|val|x(it|tends)))|
(f(inal|or(each)?|unction))|
(g(lobal|oto))|
(i(f|mplements|n(clude(_once)?|st(anceof|eadof)|terface)|sset))|
(n(amespace|ew))|
(p(r(i(nt|vate)|otected)|ublic))|
(re(quire(_once)?|turn))|
(s(tatic|witch))|
(t(hrow|r(ait|y)))|
(u(nset|se))|
(__halt_compiler|break|list|(x)?or|var|while)
)\b
2013-04-16 01:20:27
http://php5.kiev.ua/manual/ru/reserved.keywords.html
Автор:
Please note that reserved words are still not allowed to be used as namespace or as part of it:

<?php
namespace MyNameSpace\List;

class 
Test
{
}
?>

This will fail with a Parse error:  syntax error, unexpected 'List' (T_LIST), expecting identifier (T_STRING)
2016-08-15 13:08:53
http://php5.kiev.ua/manual/ru/reserved.keywords.html
Автор:
const FORBIDDEN_TYPES = [
    'null',

    'bool',
    'false',
    'true',

    'int',
    'float',

    'string',
];
2020-05-22 21:37:41
http://php5.kiev.ua/manual/ru/reserved.keywords.html
Автор:
From php8, reserved keywords such as `Interface` or `Trait` can be used as part of the namespace.

<?php
namespace App\Entity\Interface;

interface 
FooInterface
{

}

https://wiki.php.net/rfc/namespaced_names_as_token
2024-03-23 08:27:37
http://php5.kiev.ua/manual/ru/reserved.keywords.html

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