PHP不接受的文本表单[重复]

Question

最近，我开始从一个网站获取机器人，该网站不断在我的“客户反馈”表单中发布他们的网站链接。我想让我的表单拒绝任何包含“http://”或我将添加的任何其他单词/短语的文本（他们肯定会找到绕过“http://”的方法），但事实是我没有不知道该怎么做。下面是代码（需要检查“http://”的形式是$name和$comment）：

if(isset($_POST['add'])){
    $name = $_POST['name'];
    $email = $_POST['email'];
    $comment = $_POST['comment'];
    $ip = $_SERVER['REMOTE_ADDR'];
    $datetime = date('Y-m-d H:i');
    $checkIp = mysql_query("SELECT ip from comments WHERE ip = '$ip'");
    if (mysql_num_rows($checkIp) > 0) {
        echo "Only 1 feedback per IP allowed!";
        $IP = mysql_fetch_array($checkIp);
        print_r($IP);
    }
    if($name){
        if($email){
            if($comment){
                if (filter_var($email, FILTER_VALIDATE_EMAIL)) {
                    mysql_query("INSERT INTO comments (id, name, email, comment, ip, datetime) VALUES ('','$name','$email','$comment','$ip','$datetime')");
                }
                else                        
                    echo "The email address is invalid!<br><br>";
            }
            else
                echo "You haven't entered any comment!<br><br>";
        }
        else
            echo "You haven't entered an email address!<br><br>";
    }
    else
        echo "You haven't entered your name!<br><br>";  
}

谢谢！

Answer 1

您需要检查$name 或$comment 变量中是否包含子字符串，如下所示：

if (strpos($comment,'http://') === false and strpos($name, 'http://') === false) {
    echo 'continue executing your code here';
}else{
    echo 'Its a bot!';
}