PHP超级全局变量数组小结_PHP
$_GET[] 获得以GET方法提交的变量数组
$_POST[] 获得以POST方法提交的变量数组
$_COOKIE[] 获取和设置当前网站的Cookie标识
$_SESSION[] 取得当前用户访问的唯一标识，以数组形式体现，如sessionid以及自定义session数据
$_ENV[] 当前php环境变量数组
$_SERVER[] 当前php服务器变量数组
$_FILES[] 上传文件时提交到当前脚本的参数值，以数组形式体现
$_REQUEST[] 包含当前脚本提交的全部请求，
$_GET、$_POST、$_COOKIE、$_SESSION的所有动作
$GLOBALS[] 包含正在执行脚本所有超级全局变量的引用内容
PHP系统常量
__FILE__ 当前PHP程序脚本的绝对路径及文件名称
__LINE__ 存储该常量所在的行号
__FUNCTION__ 存储该常量所在的函数名称
__CLASS__ 存储该常量所在的类的名称
__METHOD__存储该常量所在的类的方法的名称
PHP_VERSION 存储当前PHP的版本号，也可以通过PHPVERSION()函数获取。
PHP_OS 存储当前服务器的操作系统
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