虽然都会在这些程序前增加一些判断和限制。但除了库文件，还有临时文件，模板文件等这些文件本来就不应该被人直接通过 web 访问到的。无论从安全性还是代码管理方面，把不能访问的文件存放到web目录下。
为什么会有这样的问题？回到以前，大部分的网站还是放到虚拟主机上，而且ftp的根目录直接就是web的根目录。为了适应这样的情况。像 phpbb, vb, discuz, ofstar的代码也只能把库文件直接存放到同一级的目录下。
但现在还有必要吗？现在的服务器价格已经比以前便宜很多，基本上一个站长就是一台服务器，差一点也是vps,另外就算虚拟主机也不会是ftp根目录与web根目录是同一个。一般都是ftp比web高一级目录。所以我们没有必要再把所有程序放到web目录下，而是把需要在web上用到的文件才放到web目录下。
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mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),
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