(PHP 5 >= 5.3.0, PHP 7)
锟斤拷锟矫伙拷卸锟斤拷锟斤拷魏锟斤拷锟斤拷锟斤拷占洌拷锟斤拷械锟斤拷锟斤拷牒拷锟斤拷亩锟斤拷宥硷拷锟斤拷锟饺拷挚占洌拷锟� PHP 锟斤拷锟斤拷锟斤拷锟斤拷锟秸硷拷锟斤拷锟角耙伙拷锟斤拷锟斤拷锟斤拷锟斤拷锟角帮拷锟斤拷锟角白� \ 锟斤拷示锟斤拷锟斤拷锟斤拷锟斤拷全锟街空硷拷锟叫碉拷锟斤拷锟狡ｏ拷锟斤拷使锟斤拷锟斤拷锟斤拷位锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟秸硷拷锟斤拷时也锟斤拷锟斤拷恕锟�
Example #1 使锟斤拷全锟街空硷拷说锟斤拷
<?php
namespace A\B\C;
/* 锟斤拷锟斤拷锟斤拷锟斤拷锟� A\B\C\fopen */
function fopen() {
/* ... */
$f = \fopen(...); // 锟斤拷锟斤拷全锟街碉拷fopen锟斤拷锟斤拷
return $f;
}
?>