PHP的语言规范：
1、php中的变量名区分大小写，但是函数名，类名，方法名，不区分大小写，但建议区分大小写
2、php代码必须书写在(php标签)，开启标记(
3、php代码每一行以分号结束，最后一行可以省略分号。
4、如果一个Php文件是由纯 php代码组成，那么php结束标识，可以省略，建议省略，如果省略，最后一行必须加分号
5、php文件名不能包含中文，路径中也不能包含中文，
6、Php文件的访问必须能过服务器(通过域名)
示例：
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