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java软件工程师学php -12.变量作用域

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Release： 2016-06-13 13:11:27
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java程序员学php -12.变量作用域
1.php比java多出了一个“文件”作用域（正式名称叫“全局作用域“，在当前php文件里有效），即写在php文件里但独立于任何函数之外的变量的作用域. 这跟javascript里定义的全局变量有点像，但在php里，函数内部无法访问此类变量。

2.通过require包含进来的文件中的变量的作用域是什么样的？ 如果你在函数里调用require()，则被包含的文件中的变量的作用域为当前函数； 否则为全局作用域

Related labels：
java javascript php require
source：php.cn
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