下面是实现的代码：
- php
- /**
- * PHP+MySQL
- * CREATE TABLE IF NOT EXISTS `ip_poll` (
- * `ip` varchar(15) NOT NULL,
- * `date` datetime NOT NULL
- * ) ENGINE=MyISAM DEFAULT CHARSET=latin1;
- *
- */
- function getIP() {
- $ip=”";
- if (getenv(“HTTP_CLIENT_IP”)) $ip = getenv(“HTTP_CLIENT_IP”);
- else if(getenv(“HTTP_X_FORWARDED_FOR”)) $ip = getenv(“HTTP_X_FORWARDED_FOR”);
- else if(getenv(“REMOTE_ADDR”)) $ip = getenv(“REMOTE_ADDR”);
- else $ip = “”;
- return $ip;
- }
- function checkVote()
- {
- $ip= getIP();
- $sql= “select count(*) from ip_poll where ip = ‘”.$ip.”‘ and SUBSTR(date,1,10) = ‘”.date(“Y-m-d”).”‘”;
- if($res= mysql_query($sql))
- {
- $row= mysql_num_rows($res);
- if($row == 0)
- {
- $sqlIns= “insert into ip_poll values (‘”.$ip.”‘,now());”;
- if(mysql_query($sqlIns))
- return true;
- else
- return false;
- }else{
- return false;
- }
- }else{
- return false;
- }
- }
- ?>
