PHP学习笔记（二）了解PHP的基本语法以及目录结构

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PHP学习笔记（二）了解PHP的基本语法以及目录结构_php技巧

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May 16, 2016 pm 08:38 PM

php basic grammar Directory Structure

通过这节课,

1.了解AppServ的目录结构

2.我们可以了解PHP的基本语法结构

1 我的AppServ安装目录是E盘:

①运用命令行的方式去操作apache服务器

apache服务器的开启和关闭:

httpd -k restart //重启
 
httpd -k stop  //关闭
 
httpd -k start //开启

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如果修改端口的话,可以在下面的目录进行修改:

AppServ\Apache2.2\conf 中的 httpd.conf(主配置文件)

②运用命令行的方式操作mysql数据库

Mysql数据库的开启和关闭:

net stop mysql //关闭数据库
 
net start mysql //开启数据库

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③Mysql数据库服务器说明:

1.安装路径:E:\AppServ\MySQL

2.命令路径:E:\AppServ\MySQL\bin

3.配置文件:E:\AppServ\MySQL\my.ini

4.数据库的存放目录:E:\AppServ\MySQL\data

E:\AppServ\MySQL\data\mysql

.frm 表结构

columns_priv.MYD 表数据

columns_priv.MYI 索引

④php的配位文件

C:\Windows\php.ini

① php标记

写一个php程序 index.php

<&#63;php
 phpinfo();
&#63;>
<&#63;php
 echo "Hello World";
  
 &#63;>

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②注意:只有.php后缀的文件中可以书写php代码,而且php代码必须卸载<?php ?>之间

③在php中写html代码,在html中嵌套php标签

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
 
 
<html>
<head>
 <title>Untitled</title>
</head>
 
 
<&#63;php
 $y=date('y');
 echo "{$y}";
 if($y>10){
  echo "目前大于10年,目前是{$y}";
   
 }else{
  
 }
  
 &#63;>
</body>
</html>

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④php注释:

/* */多行注释

//单行注释

⑤.指令分割符

必须以;结尾

⑥.php代码书写格式,注意缩进,{代码段}

⑦.php语句与函数,函数与函数之间的空行

带有大括号的上下,用空行隔开,容易阅读

⑧.变量

名字要有意义,不要用字母,单个数字,或者中文

文件名和目录名不要使用中文

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