PHP学习笔记（一）：基本语法之标记、空白、和注释，学习笔记基本语法
一、PHP 标记
1、XML风格
复制代码 代码如下:
2、简短风格
复制代码 代码如下:
3、script 风格
复制代码 代码如下:
二、PHP 注释
1、单行注释： // （C++风格）
2、多行注释：/* */ （C风格）
3、单行脚本注释：# （shell风格）
Tips：注释一般写在代码上面
三、PHP 空白
1、空白间隔符
换行（回车）、空格、Tab（制表符）
2、约定习俗
代码片段（2行）、类（2行）、函数（1行）、函数变量与第一条语句（1行）、注释前（1行）
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