require.include.require_once.include_once的用法和区别
require.include.require_once.include_once的用法和区别
四种引用文件的方法：require . include . require_once . include_once。
require 的使用方法如 require("MyRequireFile.php"); 。这个函数通常放在 PHP 程序的最前面，PHP 程序在执行前，就会先读入 require 所指定引入的文件，使它变成 PHP 程序网页的一部份。常用的函数，亦可以这个方法将它引入网页中。
include 使用方法如 include("MyIncludeFile.php"); 。这个函数一般是放在流程控制的处理部分中。PHP 程序网页在读到 include 的文件时，才将它读进来。这种方式，可以把程序执行时的流程简单化.
require_once 和 include_once 的方法跟 require 和 include 的方法一样,它们的区别只是 require_once 和 include_once 只会将文件包含一次,不会重复包含.
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