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PHP中的include跟require

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Release: 2016-06-13 12:23:20
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PHP中的include和require

一、有什么用?

服务器端包含 (Server Side Include,SSI) 用于创建可在多个页面重复使用的函数、页眉、页脚或元素。包含文件重用了文件,省去了许多工作。

二、怎么用?

include ‘filename’;

require ‘filename’;


1.php

<code class=" hljs php"><span class="hljs-preprocessor"><?php</span><span class="hljs-keyword">echo</span> <span class="hljs-string">"Hello "</span>;<span class="hljs-keyword">include</span> <span class="hljs-string">'2.php'</span>;<span class="hljs-preprocessor">?></span></code>
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2.php

<code class=" hljs xml"><span class="php"><span class="hljs-preprocessor"><?php</span><span class="hljs-keyword">echo</span> <span class="hljs-string">"World."</span>;<span class="hljs-preprocessor">?></span></span></code>
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在浏览器访问1.php会得到(注意此时1.php和2.php是放在同一个文件夹里的):Hello World.

三、include跟require有什么区别?

在错误处理方面:
require 会生成致命错误(E_COMPILE_ERROR)并停止脚本
include 只生成警告(E_WARNING),并且脚本会继续


请在此时使用:
请在此时使用 require:当文件被应用程序请求时。
请在此时使用 include:当文件不是必需的,且应用程序在文件未找到时应该继续运行时。

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