PHP 8.1.0 RC 4 available for testing

Lista de palabras reservadas

Estas palabras tienen un significado especial en PHP. Algunas representan cosas que se parecen a funciones, otras se parecen a constantes, etc.; pero no lo son en realidad: son constructores del lenguaje. Las siguientes palabras no pueden utilizarse como constantes, nombres de clases, nombres de funciones o métodos. Se pueden usar como nombres de variables, pero podría dar lugar a confusiones. Sin embargo, se permiten como propiedades, constantes y métodos de clases, interfaces y traits, excepto que la clase no se pueda usar como nombre de constante.

Palabras reservadas de PHP
__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 finally fn (a partir de PHP 7.4) for foreach
function global goto if implements
include include_once instanceof insteadof interface
isset() list() match (a partir de PHP 8.0) namespace new
or print private protected public
require require_once return static switch
throw trait try unset() use
var while xor yield yield from
Constantes en tiempo de compilación
__CLASS__ __DIR__ __FILE__ __FUNCTION__ __LINE__ __METHOD__
__NAMESPACE__ __TRAIT__
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User Contributed Notes 5 notes

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29
martindilling at gmail dot com
8 years ago
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
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19
Thomas Hansen
5 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)
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19
Chris
9 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.
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-10
Johnny D.
1 year ago
const FORBIDDEN_TYPES = [
    'null',

    'bool',
    'false',
    'true',

    'int',
    'float',

    'string',
];
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-37
bla at taxistop dot be
3 years ago
This list doesn't include 'self' and 'parent', which I take are indeed keywords.
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