PHP开发 红蓝两方投票功能教程之PHP
创建vote.php文件
前端请求了后台的vote.php，vote.php将根据接收的参数，连接数据库，调用相关函数。
header("Content-type:text/html;charset=utf-8");
$action = $_GET['action'];
$id = 1;
$ip = get_client_ip();//获取ip
if($action=='red'){//红方投票
vote(1,$id,$ip);
}elseif($action=='blue'){//蓝方投票
vote(0,$id,$ip);
}else{
echo jsons($id);
}
$action = $_GET['action'];
$id = 1;
$ip = get_client_ip();//获取ip
if($action=='red'){//红方投票
vote(1,$id,$ip);
}elseif($action=='blue'){//蓝方投票
vote(0,$id,$ip);
}else{
echo jsons($id);
}
函数vote($type,$id,$ip)用来做出投票动作，$type表示投票方，$id表示投票主题的id，$ip表示用户当前ip。首先根据用户当前IP，查询投票记录表votes_ip中是否已经存在当前ip记录，如果存在，则说明用户已投票，否则更新红方或蓝方的投票数，并将当前用户投票记录写入到votes_ip表中以防重复投票。
function vote($type,$id,$ip){
$conn=mysqli_connect("localhost","root","root","vote");
$ip_sql="select ip from votes_ip where vid='$id' and ip='$ip'";
$que=mysqli_query($conn,$ip_sql);
$count=mysqli_num_rows($que);
if($count==0){//还没有投票
if($type==1){//红方
$sql = "update votes set likes=likes+1 where id=".$id;
}else{//蓝方
$sql = "update votes set unlikes=unlikes+1 where id=".$id;
}
mysqli_query($conn,$sql);
$sql_in = "insert into votes_ip (vid,ip) values ('$id','$ip')";
$result = mysqli_query($conn,$sql_in);
if($result > 0){
echo jsons($id);
}else{
$arr['success'] = 0;
$arr['msg'] = '操作失败，请重试';
echo json_encode($arr);
}
}else{
$arr['success'] = 0;
$arr['msg'] = '已经投票过了';
echo json_encode($arr);
}
}
$conn=mysqli_connect("localhost","root","root","vote");
$ip_sql="select ip from votes_ip where vid='$id' and ip='$ip'";
$que=mysqli_query($conn,$ip_sql);
$count=mysqli_num_rows($que);
if($count==0){//还没有投票
if($type==1){//红方
$sql = "update votes set likes=likes+1 where id=".$id;
}else{//蓝方
$sql = "update votes set unlikes=unlikes+1 where id=".$id;
}
mysqli_query($conn,$sql);
$sql_in = "insert into votes_ip (vid,ip) values ('$id','$ip')";
$result = mysqli_query($conn,$sql_in);
if($result > 0){
echo jsons($id);
}else{
$arr['success'] = 0;
$arr['msg'] = '操作失败，请重试';
echo json_encode($arr);
}
}else{
$arr['success'] = 0;
$arr['msg'] = '已经投票过了';
echo json_encode($arr);
}
}
函数jsons($id)通过查询当前id的投票数，计算比例并返回json数据格式供前端调用。
function jsons($id){
$query = mysql_query("select * from votes where id=".$id);
$row = mysql_fetch_array($query);
$red = $row['likes'];
$blue = $row['unlikes'];
$arr['success']=1;
$arr['red'] = $red;
$arr['blue'] = $blue;
$red_percent = round($red/($red+$blue),3);
$arr['red_percent'] = $red_percent;
$arr['blue_percent'] = 1-$red_percent;
return json_encode($arr);
}
$query = mysql_query("select * from votes where id=".$id);
$row = mysql_fetch_array($query);
$red = $row['likes'];
$blue = $row['unlikes'];
$arr['success']=1;
$arr['red'] = $red;
$arr['blue'] = $blue;
$red_percent = round($red/($red+$blue),3);
$arr['red_percent'] = $red_percent;
$arr['blue_percent'] = 1-$red_percent;
return json_encode($arr);
}
获取用户真实IP的函数：get_client_ip()
function get_client_ip() {
if (getenv("HTTP_CLIENT_IP") && strcasecmp(getenv("HTTP_CLIENT_IP"), "unknown"))
$ip = getenv("HTTP_CLIENT_IP");
else
if (getenv("HTTP_X_FORWARDED_FOR") && strcasecmp(getenv("HTTP_X_FORWARDED_FOR"), "unknown"))
$ip = getenv("HTTP_X_FORWARDED_FOR");
else
if (getenv("REMOTE_ADDR") && strcasecmp(getenv("REMOTE_ADDR"), "unknown"))
$ip = getenv("REMOTE_ADDR");
else
if (isset ($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], "unknown"))
$ip = $_SERVER['REMOTE_ADDR'];
else
$ip = "unknown";
return ($ip);
}
if (getenv("HTTP_CLIENT_IP") && strcasecmp(getenv("HTTP_CLIENT_IP"), "unknown"))
$ip = getenv("HTTP_CLIENT_IP");
else
if (getenv("HTTP_X_FORWARDED_FOR") && strcasecmp(getenv("HTTP_X_FORWARDED_FOR"), "unknown"))
$ip = getenv("HTTP_X_FORWARDED_FOR");
else
if (getenv("REMOTE_ADDR") && strcasecmp(getenv("REMOTE_ADDR"), "unknown"))
$ip = getenv("REMOTE_ADDR");
else
if (isset ($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], "unknown"))
$ip = $_SERVER['REMOTE_ADDR'];
else
$ip = "unknown";
return ($ip);
}
vote.php完整代码
0){ echo jsons($id); }else{ $arr['success'] = 0; $arr['msg'] = '操作失败，请重试'; echo json_encode($arr); } }else{ $arr['success'] = 0; $arr['msg'] = '已经投票过了'; echo json_encode($arr); } } function jsons($id){ $conn=mysqli_connect("localhost","root","root","vote"); $que_sql="select * from votes where id=".$id; $query = mysqli_query($conn,$que_sql); $row = mysqli_fetch_array($query); $red = $row['likes']; $blue = $row['unlikes']; $arr['success']=1; $arr['red'] = $red; $arr['blue'] = $blue; $red_percent = round($red/($red+$blue),3); $arr['red_percent'] = $red_percent; $arr['blue_percent'] = 1-$red_percent; return json_encode($arr); } //获取用户真实IP function get_client_ip() { if (getenv("HTTP_CLIENT_IP") && strcasecmp(getenv("HTTP_CLIENT_IP"), "unknown")) $ip = getenv("HTTP_CLIENT_IP"); else if (getenv("HTTP_X_FORWARDED_FOR") && strcasecmp(getenv("HTTP_X_FORWARDED_FOR"), "unknown")) $ip = getenv("HTTP_X_FORWARDED_FOR"); else if (getenv("REMOTE_ADDR") && strcasecmp(getenv("REMOTE_ADDR"), "unknown")) $ip = getenv("REMOTE_ADDR"); else if (isset ($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], "unknown")) $ip = $_SERVER['REMOTE_ADDR']; else $ip = "unknown"; return ($ip); } ?>
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