(PHP 5 >= 5.3.0, PHP 7)
什么锟斤拷锟斤拷锟斤拷锟秸间?锟接癸拷锟斤拷锟斤拷锟斤拷说锟斤拷锟斤拷锟斤拷锟秸硷拷锟斤拷一锟街凤拷装锟斤拷锟斤拷姆锟斤拷锟斤拷锟斤拷诤芏锟截凤拷锟斤拷锟斤拷锟皆硷拷锟斤拷锟斤拷锟街筹拷锟斤拷锟斤拷睢o拷锟斤拷纾拷诓锟斤拷锟较低筹拷锟侥柯硷拷锟斤拷锟斤拷锟斤拷锟斤拷锟侥硷拷锟斤拷锟介,锟斤拷锟斤拷目录锟叫碉拷锟侥硷拷锟斤拷说锟斤拷锟斤拷锟酵帮拷锟斤拷锟斤拷锟斤拷锟斤拷锟秸硷拷慕锟缴拷锟斤拷锟斤拷锟劫革拷锟斤拷锟接o拷锟侥硷拷 foo.txt 锟斤拷锟斤拷同时锟斤拷目录/home/greg 锟斤拷 /home/other 锟叫达拷锟节o拷锟斤拷锟斤拷同一锟斤拷目录锟叫诧拷锟杰达拷锟斤拷锟斤拷锟斤拷 foo.txt 锟侥硷拷锟斤拷锟斤拷锟解,锟斤拷目录 /home/greg 锟斤拷锟斤拷锟� foo.txt 锟侥硷拷时锟斤拷锟斤拷锟角憋拷锟诫将目录锟斤拷锟皆硷拷目录锟街革拷锟斤拷锟斤拷锟斤拷锟侥硷拷锟斤拷之前锟矫碉拷 /home/greg/foo.txt锟斤拷锟斤拷锟皆拷锟接︼拷玫锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷占锟侥革拷锟筋。
锟斤拷PHP锟叫o拷锟斤拷锟斤拷锟秸硷拷锟斤拷锟斤拷锟斤拷锟斤拷诒锟叫达拷锟斤拷锟接︼拷贸锟斤拷锟绞憋拷锟斤拷锟斤拷锟斤拷锟斤拷玫拇锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷时锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟解:
PHP 锟斤拷锟斤拷锟秸硷拷锟结供锟斤拷一锟街斤拷锟斤拷氐锟斤拷唷拷锟斤拷锟斤拷统锟斤拷锟斤拷锟较碉拷一锟斤拷锟酵撅拷锟斤拷锟斤拷锟斤拷锟斤拷锟揭伙拷锟剿碉拷锟� PHP 锟斤拷锟斤拷锟秸硷拷锟斤法锟斤拷示锟斤拷锟斤拷
Example #1 锟斤拷锟斤拷锟秸硷拷锟斤法示锟斤拷
<?php
namespace my\name; // 锟轿匡拷 "锟斤拷锟斤拷锟斤拷锟斤拷锟秸硷拷" 小锟斤拷
class MyClass {}
function myfunction() {}
const MYCONST = 1;
$a = new MyClass;
$c = new \my\name\MyClass; // 锟轿匡拷 "全锟街空硷拷" 小锟斤拷
$a = strlen('hi'); // 锟轿匡拷 "使锟斤拷锟斤拷锟斤拷锟秸间:锟斤拷全锟街猴拷锟斤拷/锟斤拷锟斤拷" 小锟斤拷
$d = namespace\MYCONST; // 锟轿匡拷 "namespace锟斤拷锟斤拷锟斤拷锟斤拷__NAMESPACE__锟斤拷锟斤拷" 小锟斤拷
$d = __NAMESPACE__ . '\MYCONST';
echo constant($d); // 锟轿匡拷 "锟斤拷锟斤拷锟秸硷拷投锟教拷锟斤拷锟斤拷锟斤拷锟�" 小锟斤拷
?>
Note:
锟斤拷为PHP锟斤拷php锟斤拷锟斤拷锟斤拷锟秸间,锟皆硷拷锟斤拷锟斤拷些锟斤拷锟街匡拷头锟斤拷锟斤拷锟斤拷锟秸间(锟斤拷锟斤拷PHP\Classes锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟节猴拷使锟矫o拷锟斤拷锟斤拷应锟斤拷锟斤拷锟矫伙拷锟秸硷拷拇锟斤拷锟斤拷锟绞癸拷谩锟�