PHP超全局数组(Superglobals)介绍_php实例
概述
想做一个微信的公众平台,阅读了微信官方给的网址接入的示例代码,发现有个问题好像一直都是半知半解的,就是在类里边直接使用$_GET。仔细查了下关于这方面的知识,发现PHP中这部分的基础知识掌握的不是很牢靠。
变量的作用域
提到PHP的超全局数组,就不能不说下变量的作用域。变量的作用域是任何一门编程语言中都有的概念,也是必须掌握的。关于PHP中的变量作用域,这里不再多说,大家可以自己查看资料。
超全局数组
超全局数组是PHP中特殊定义的数组变量,之所以称为超全局数组是因为这些数组在脚本中的任何地方、任何作用域内都可以访问,如函数、类、文件等。
PHP中的超全局数组包括以下几个:
$GLOBALS
$_SERVER
$_GET
$_POST
$_REQUEST
$_COOKIE
$_SESSION
$_FILES
$_ENV
注意
有一点需要注意的是PHP中全局变量和超全局数组的区别,在类中并不能直接访问全局变量。
总结
以后要对基础知识更加重视,及时解决自己心中的疑问。

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