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现代php基石composer #30

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@luanguang

require 如果文件不存在,则报错fatal error,并停止脚本;
include如果文件不存在,则出现warning,并继续脚本;
require_onceinclude_once在执行过程中,都先检验是否已经加载,加载过就不加载了。
__DIR__返回当前文件的绝对路径
比如Laravelpublic/index.php中,返回的就是

/var/www/yangmao/public/../vendor/autoload.php

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