php 广告点击统计代码(php+mysql)

CREATE TABLE IF NOT EXISTS `ad_count` (`ad_id` int(8) NOT NULL auto_increment,`ad_hit` int(8) NOT NULL default '0',`ad_name` varchar(200) character set gb2312 default NULL,`ad_datetime` datetime default NULL,`ad_qq` varchar(15) character set gb2312 default NULL,`ad_url` varchar(900) character set gb2312 NOT NULL,`ad_price` int(8) NOT NULL,PRIMARY KEY (`ad_id`)) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=4 ;

<?php require_once("......省了"); $ad_id =get_value('ad_id','');这里下面有讲 if(is_numeric( $ad_id ) ){   $ad_select="select ad_id,ad_url from ad_count where ad_id='$ad_id' limit 1";    $ad_update="Update ad_count set ad_hit=ad_hit+1 where ad_id='$ad_id' limit 1";    $ad_result=mysql_query($ad_select) or die('id error');     if( mysql_num_rows( $ad_result) ){       mysql_query($ad_update);        $ad_rs=mysql_fetch_array($ad_result);        header("location:".$ad_rs['ad_url']);        mysql_free_result($ad_rs);          } }function htmltohtml($Str){ $temp =str_replace(chr(13),'<br/>',$Str); $temp =str_replace('<','<',$Str); $temp =str_replace('>','>',$Str); $temp =addslashes($Str); return $temp; } function get_value($value,$para){  return htmltohtml(empty($para)?(isset($_GET[$value])?$_GET[$value]:''):(isset($_POST[$value])?$_POST[$value]:'')); }