php (九) PHP预定义数组
预定义数组：
自动全局变量---超全局数组
1.包含了来自web服务器，客户端，运行环境和用户输入的数据
2.这些数组比较特别
3.全局范围内自动生效，都可以直接使用这些数组
4.用户不能自定义这些数组
5.在函数中可以直接使用这些数组
$_GET //经由URL请求提交至脚本的变量
$_POST //经由HTTP POST 方法提交脚本的变量
$_REQUEST //经由get，post和cookie机制提交到脚本的变量，因此该数组并不值得我们信任和使用，尽量不去使用
$_FILES //经由http post 文件上传而提交至脚本，文件上传
$_COOKIE //会话控制
$_SESSION //会话控制
$_ENV //执行环境提交至脚本
$GLOBALS //只要是当前脚本有效的变量全在这里 ，数组键名为全局变量的名称
$_SERVER //变量有由web服务器设定或直接和当前脚本执行环境关联
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