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
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.
As of PHP 7.0.0 these keywords are allowed as property, constant, and method names of classes, interfaces and traits, except that class may not be used as constant name.
| __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 | |
| 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) | yield from (as of PHP 7.0) |
| __CLASS__ | __DIR__ (as of PHP 5.3) | __FILE__ | __FUNCTION__ | __LINE__ | __METHOD__ |
| __NAMESPACE__ (as of PHP 5.3) | __TRAIT__ (as of PHP 5.4) |
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User Contributed Notes 4 notes
martindilling at gmail dot com ¶
6 years ago
Thomas Hansen ¶
3 years ago
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)
Chris ¶
6 years ago
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.
bla at taxistop dot be ¶
1 year ago
This list doesn't include 'self' and 'parent', which I take are indeed keywords.
