【单选题】【消耗次数：1】
PHP中存在多种变量，其中在函数外定义的变量称之为（ ）。
①
局部变量
②
变量
③
超全局变量
④
全局变量
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相关题目
【单选题】
如果局部变量和成员变量同名，如何在局部变量作用域内引用成员变量？（ ）
①
不能引用，必须改名，使它们的名称不相同
②
在成员变量前加 this，使用 this 访问该成员变量
③
在成员变量前加 super，使用 super 访问该成员变量
④
不影响，系统可以自己区分
【单选题】
按照变量的作用域可将变量划分为（）。
①
公有、私有、系统
②
全局变量、模块级变量、过程级变量
③
动态、常数、静态
④
Public 、 Private、 Protected
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