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超全局变量 »
« 引用定位
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预定义变量
对于全部脚本而言,PHP 提供了大量的预定义变量。这些变量将所有的
外部变量
表示成内建环境变量,并且将错误信息表示成返回头。
目录
超全局变量
— 在全部作用域中始终可用的内置变量
$GLOBALS
— 引用全局作用域中可用的全部变量
$_SERVER
— 服务器和执行环境信息
$_GET
— HTTP GET 变量
$_POST
— HTTP POST 变量
$_FILES
— HTTP 文件上传变量
$_REQUEST
— HTTP Request 变量
$_SESSION
— Session 变量
$_ENV
— 环境变量
$_COOKIE
— HTTP Cookies
$php_errormsg
— 前一个错误信息
$http_response_header
— HTTP 响应头
$argc
— 传递给脚本的参数数目
$argv
— 传递给脚本的参数数组
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