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HomeBackend DevelopmentPHP Tutorialphp中遇到的小疑点(随遇随记)

php中遇到的小问题(随遇随记)
mysql:
1、distinct  提取数据库中不重复数据的字段约束
2、SELECT COUNT(*) from t_sum_duihuan WHERE t_pid=9 or t_pid=10 or t_pid=11 or t_pid=12
3、时间戳推算日期的,例如求最近一周内的信息:
select * from 表 where dateline > (unix_timestamp()-3600*24*7)
4、得到最近三十天内每天的记录:
select count(id),date(addTime) from ad_user where date_sub(current_date(),interval 30 day)
php:
1、htmlspecialchars_decode()               将取出的html样式的编码复原
2、直接输出sql的编写进行条件检测等:echo "要检测的具体的sql语句";
3、数据库事先已定义好的连接,如$dblink,用于函数时时,必须先声明此变量,
如:function getmysql(){
       global $dblink;
       //具体的实现代码
       }
4、js中写路径传值的格式:
如:
      phptime='+time+'&methods=ex&cid='+cid+'&classtime='+classtime ;
       return phptime;
5、排名:如下:
$paiming = $dblink->mem_fetch_only ( "SELECT COUNT(score) from t_sum_account WHERE score>(SELECT score FROM t_sum_account WHERE uid=$cyask_uid)",0 );
$paiming = $paiming + 1;//可使一样分值的人同名次排序
6、插入数据库之前一定要判断时区设置是否正确,要不作为比较判断时间段的条件时麻烦可就大了,吃过这样的亏所以就先记下了:
date_default_timezone_set ( "Asia/Shanghai" );$now = time ();这样取到的今日的时间戳绝对没问题、
7、编辑模板时习惯用dw,结果预览效果中火狐使用正常,ie却总是往左边跑,样式大变,这可能是引入的其他文件编码不一致导致的哦
8、本地安装开发环境时,针对域名这块儿,要配置两个地方:
C:\WINDOWS\system32\drivers\etc   hosts
D:\workspace\wamp\Apache2\conf\extra httpd-vhosts.conf
9、如何让一张图片、链接有表单提交功能?
onclick="document.formName.submit()"
10、数组中元素的个数:count($arrayname)


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