Question

我需要添加两个要求。

域名必须没有变音符号
域名必须至少包含3个字符

此转移到下面提到的错误消息（错误：域名不能留空。）

<form action="" method=post>
    <table>
        <tr>
            <td><input type="text" name="domain_name" style="width:170px;"></td>
            <td>
                <select name="suffix" style="width:75px;">
                    <option value=".sk" align="left">.sk</option>
                </select>  
            </td> 
        </tr>
        <tr>
            <td><input type="submit" id="popUpYes" name="check" value="Check"></td>
        </tr>
    </table>
</form>    

<?php

    if(isset($_POST['check'])) { 
        if (!empty($_POST['domain_name'])){
            $name_domain = trim($_POST['domain_name']).$_POST['suffix'];
            $response = @dns_get_record($name_domain, DNS_ALL);

            if(empty($response)){
                echo "<span style='color:red;'>Domain is free.</span>";
            }else{ 
                echo "<span style='color:red;'>Domain is registered.</span>";
            }
        }
        else {
            echo "<span style='color:red;'>Error: Domain name can not be left empty.</span>";
        }
    }
?>

Answer 1

<?php

if(isset($_POST['check'])) {

  if (!empty($_POST['domain_name'])){
     if (strlen ($_POST['domain_name']) > 3){
        if (preg_match ("/^\w+$/", $_POST['domain_name'] )){
           $name_domain = trim($_POST['domain_name']).$_POST['suffix'];
           $response = @dns_get_record($name_domain, DNS_ALL);
           if(empty($response)){
             echo "<span style='color:red;'>Domain is free.</span>";

           }else{ 
             echo "<span style='color:red;'>Domain is registered.</span>";
           }
        }
        else {
           echo "<span style='color:red;'>Error: Domain name characters must to be alphanumeric.</span>";
        }
    }
    else {
       echo "<span style='color:red;'>Error: Domain name must contain at least 3 characters.</span>";
    }
 }
 else {
    echo "<span style='color:red;'>Error: Domain name can not be left empty.</span>";
 }
}
?>

Answer 2

 if(empty($response)){
     if(preg_match('/[^-_a-z0-9.]/iu', $_POST['domain_name'])){
     if(strlen(strpbrk($_POST['domain_name'], '.')) > 3) {
      echo "<span style='color:red;'>Domain is free.</span>";
}
}


     }

PHP表单 - 字段的条件

2 个答案: