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PHP Server ($_SERVER,$HTTP_SERVER_VARS)
Handling HTTP requests in PHP
![php 全局变量$_SERVER，$_SERVER['SERVER_NAME']与$_SERVER['HTTP_HOST ']的区别_小艳爱程序的博客-CSDN博客](https://img-blog.csdn.net/20180713121238169?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMDEyNzkx/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70 "php 全局变量$_SERVER，$_SERVER['SERVER_NAME']与$_SERVER['HTTP_HOST ']的区别_小艳爱程序的博客-CSDN博客")
php 全局变量$_SERVER，$_SERVER['SERVER_NAME']与$_SERVER['HTTP_HOST ']的区别_小艳爱程序的博客-CSDN博客
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Global Variables - Superglobals Several predefined variables in PHP are "superglobals", which means that they are always accessible, regardless of scope. - ppt download
