1、投票主界面（问题界面）

<?php
$db = new Mysqli("localhost","root","root","db_0808");
$sql = "select * from vote_category ";
$result=$db->query($sql);
$data_category=$result->fetch_all();
?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <table border="1">
<?php
        foreach($data_category as $item){
        echo "<tr><th> <a href='vote.php?id={$item[0]}&is_radio={$item[2]}'>{$item[1]}</a></th></tr>";
        }
?>
    </table>

</body>
</html>
2、投票选项界面
<?php
    $category_id=$_GET['id'];
    $is_radio=$_GET['is_radio'];
    $db = new Mysqli("localhost","root","root","db_0808");
    $sql = "select * from vote_info WHERE category_id={$category_id}";
    $result=$db->query($sql);
    $data=$result->fetch_all();
?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>

</head>
<body>
<form action="vote_action.php" method="post">
    <table border="1">
        <tr>
            <td>item</td>
            <td>check</td>
        </tr>
        <?php
        if($is_radio==1){
        foreach($data as $i){
            echo "<tr><td>{$i[1]}</td><td><input type='radio' name='item' value='{$i[0]}'></td></tr>";
        }
        }else{
        foreach($data as $i){
            echo "<tr><td>{$i[1]}</td><td><input type='checkbox' name='item[]' value='{$i[0]}'></td></tr>";
        }
        }
        ?>
    </table>
    <input type="submit" value="submit">
</form>
</body>
</html>
3、投票处理文件
<?php
$item=$_POST['item'];
$db = new Mysqli("localhost","root","root","db_0808");
if(is_array($item)){
    $str=implode(",",$item);
    $sql="update vote_info set count=count+1 where id in ({$str})";
}else{
    $sql="update vote_info set count=count+1 where id={$item}";
}

$result=$db->query($sql);
if($result){
    echo "success";
}