PHP 关键词

__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 (从PHP 5.5开始)	for	foreach	function
global	goto (从PHP 5.3开始)	if	implements	include
include_once	instanceof	insteadof (从PHP 5.4开始)	interface	isset()
list()	namespace (从PHP 5.3开始)	new	or	print
private	protected	public	require	require_once
return	static	switch	throw	trait (从PHP 5.4开始)
try	unset()	use	var	while
xor	yield (从PHP 5.5开始)

编译时常量

__CLASS__	__DIR__ (从PHP 5.3开始)	__FILE__	__FUNCTION__	__LINE__
__METHOD__	__NAMESPACE__ (从PHP 5.3开始)	__TRAIT__ (从PHP 5.4开始)