PHP中的auto_prepend_file和auto_append_file
在开发PHP程序的时候，我们有时候会在每个PHP的脚本的开头和结尾编写相同的代码。比如，我们常常需要在每个PHP页面中打开和关闭session或者建立和关闭数据库连接。优秀的程序员通常会寻找一种简单的方式以避免编写相同的代码。
在PHP的配置文件中，有两个配置项auto_prepend_file和auto_append_file,我们可以为这两个配置项指定两个不同的文件，让这两个文件中的代码在分别在每个PHP页面执行之前和执行结束之后执行。我们可以在PHP的配置文件php.ini中对这两个选项进行配置同时也可以在.htaccess文件中对这两个选项进行配置，具体采用哪种方式根据个人喜好选择。
由于PHP中的这个配置比较简单，所以仅做下简单的介绍：
1.auto_prepend_file—-指定在每个PHP页面执行前所要执行的代码。
2.auto_append_file—-指定在每个PHP页面执行完成后所要执行的代码。
PHP中关于这两个配置项的使用非常简单。大家简单试验下就能完全理解了。
其实，这两个配置项的作用等同于PHP中的require语句。所以，如果不是必须要使用这个功能，大家尽量不要使用PHP的这个功能，因为这会使我们代码的可读性变得非常差。
只是一个简单的小功能，因为遇到了，所以简单做下记录
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