PHP: Lista de palabras reservadas

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 4 notes

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martindilling at gmail dot com ¶

11 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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Thomas Hansen ¶

8 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)

down

Chris ¶

12 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.

down

-1

Chocopie ¶

7 months ago

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

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