php学习笔记

cookie部分
1.setcookie("user","xiangzishi110",time()+3600);//设置user的变量，有效期为3600秒
2.setcookie("user","",time()-3600);//注销
3.$_COOKIE["user"];//调用
4 if(isset($_COOKIE["user"])){}//判断是否设置了user的cookie

session部分
1.<?php session_start();?>//在head前就需要调用session_start();
2.$_SESSION["user"];
3.if(isset($_SESSION["user"])){}
4.unset($_SESSION["user"]);//释放user的session
5.session_destroy();//彻底终结session

mysql语句
insert into article (title,content,id) value ('第一本',‘这个书很好看’，null)
select * from article order by id desc
delete from article where id=1
update article set title='第二本' where id=2

数据库操作
mysql_fetch_array
mysql_fetch_assoc 返回关联数组
mysql_num_rows($result) 返回查询结果条数
mysql_unbuffered_query()
mysql_query()
mysqli_real_escape_string( $link,$GET['username'] )