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PHP中的变量，PHP变量

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Release： 2016-06-13 08:43:02
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PHP中的变量，PHP变量

PHP中的变量

    程序是由代码与数据两部分组成，数据存储在变量，变量的本质是内存中的一个存储空间。变量对应的空间有一个名子，叫变量名，变量名用于对数据进行读写。

变量的定义

在php变量名之前必须使用'$'符号，也可以理解为'$'就是定义变量的语法结构

示例：

变量的访问

echo 变量名;

示例：

变量的修改

变量名=值;

变量的删除

unset(变量名);

示例：

 

变量的命名规范：

1、必须以'$'开头

2、只能包含字母、数字、下划线

3、'$'符号后不能以数字开头

Related labels：
php
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