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php学习笔记之--php基本语法

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Jun 23, 2016 pm 02:29 PM

php基本语法

　　1.1PHP语言标记

　　1.2指令分隔符“分号”

　　1.3程序中的注释

内容

1.1四种PHP语言标记(同一页面统一风格)

　　推荐使用这个

　　=$var ?>

1.2指令分隔符“;”

　　语句分两种：

　　　　一种是功能执行语句（赋值/输出等）

　　　　　　后面一定要加分号

　　　　　　与?>最近一条语句可以不加分号，建议都加分号

　　　　一种是结构定义语句（if/for/while/class/function等带大括号的）

　　　　　　后面一定不要加分号

1.3程序中的注释

　　单行注释 //

　　脚本注释 #

　　文档注释 /*

　　多行注释 /* */

　　注：1.多行注释中不能再包含多行注释

　　　　2.注释要写在代码的上面或是右边

　　注释的作用

　　　　1.将以前写过的不合适的代码注释掉

　　　　2.写帮助文档

　　　　3.调试程序

还有一些PHP常用的一些编程规范：http://www.cnblogs.com/mo-beifeng/archive/2011/10/11/2207187.html

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