(PHP 4, PHP 5, PHP 7)
include_once 锟斤拷锟斤拷诮疟锟街达拷锟斤拷诩锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷指锟斤拷锟侥硷拷锟斤拷锟斤拷锟斤拷为锟斤拷 include 锟斤拷锟斤拷锟斤拷疲锟轿ㄒ伙拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟侥硷拷锟斤拷锟窖撅拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟津不伙拷锟劫次帮拷锟斤拷锟斤拷锟斤拷同锟斤拷锟斤拷锟斤拷锟斤拷职锟绞撅拷锟斤拷锟斤拷锟斤拷锟街伙拷锟斤拷锟斤拷一锟轿★拷
include_once 锟斤拷锟斤拷锟斤拷锟斤拷锟节脚憋拷执锟斤拷锟节硷拷同一锟斤拷锟侥硷拷锟叫匡拷锟杰憋拷锟斤拷锟斤拷锟斤拷锟斤拷一锟轿碉拷锟斤拷锟斤拷拢锟斤拷锟饺凤拷锟斤拷锟街伙拷锟斤拷锟斤拷锟揭伙拷锟斤拷员锟斤拷夂拷锟斤拷囟锟斤拷澹拷锟斤拷锟斤拷锟斤拷赂锟街碉拷锟斤拷锟斤拷狻�
锟斤拷锟斤拷锟斤拷息锟轿硷拷 include 锟侥碉拷锟斤拷
Note:
锟斤拷 PHP 4锟叫ｏ拷_once 锟斤拷锟斤拷为锟节诧拷锟斤拷锟街达拷小写锟斤拷母锟侥诧拷锟斤拷系统锟斤拷锟斤拷锟斤拷 Windows锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷同锟斤拷锟斤拷锟界：
Example #1 include_once 锟斤拷 PHP 4 锟斤拷锟斤拷锟节诧拷锟斤拷锟街达拷小写锟侥诧拷锟斤拷系统锟斤拷
<?php
include_once "a.php"; // 锟解将锟斤拷锟斤拷 a.php
include_once "A.php"; // 锟解将锟劫次帮拷锟斤拷 a.php锟斤拷锟斤拷锟斤拷 PHP 4锟斤拷
?>锟斤拷锟斤拷为锟斤拷 PHP 5 锟叫革拷锟剿ｏ拷锟斤拷锟斤拷锟斤拷 Windows 锟斤拷路锟斤拷锟饺憋拷锟斤拷窕锟斤拷锟斤拷 C:\PROGRA~1\A.php 锟斤拷 C:\Program Files\a.php 锟斤拷实锟斤拷一锟斤拷锟斤拷锟侥硷拷只锟结被锟斤拷锟斤拷一锟轿★拷