PHP require 在计算为假的语句中也会执行？大错特错

首次发表时间: 2014年4月15日 | 最后更新时间: 2014年12月4日 | 作者: nikbobo

文章目录[隐藏]

缘起
分析
实践

缘起

今天，和我一起做项目的朋友跟我提了一个问题，他让我尽量使用 include，少使用 require，这使我感到十分奇怪。

询问一下，他给出的答案竟然是 include 好控制，而 require 不好控制，并且提出了一个让我感到奇怪的观点——require 在计算为假的语句中也会执行。
这，我在 PHP 手册中从来没看到过，也从来没听说过。

分析

PHP 手册中说：

如果最后仍未找到文件则 include 结构会发出一条警告；这一点和 require 不同，后者会发出一个致命错误。

require 和 include 几乎完全一样，除了处理失败的方式不同之外。require 在出错时产生 E_COMPILE_ERROR 级别的错误。换句话说将导致脚本中止而 include 只产生警告（E_WARNING），脚本会继续运行。

实践

对于这个问题，我决定试试看，毕竟实践出真知。闲来无聊，试试看不就知道了。
测试环境：PHP 5.3.28
代码：
file.php：

<?php
echo 'Is Show?'
?>

require.php

<?php
echo 'Hello!'
if (false) {
    require 'file.php';
}
?>

结果，得到了以下输出：

Hello!

现在有答案了吧？
更多内容见：
我在知乎的提问：PHP require 在计算为假的语句中也会执行？

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