Question

<?php
echo "<h1>Register</h1>";

$submit = isset($_POST['submit']);

$fullname = strip_tags(isset($_POST['fullname']));
$username = strip_tags(isset($_POST['username']));

$password = strip_tags(isset($_POST['password']));
$repeatpassword = strip_tags(isset($_POST['repeatpassword']));
$date = date("Y-m-d");

if ($submit)
{
    if ($fullname&&$username&&$password&&$repeatpassword)
    {


    }
    else
        echo "Please fill in <b>all</b> fields! ";  
}

?>

上面的PHP代码是带有isset函数的已编辑代码。 为什么单击注册按钮后没有出现echo "Please fill in <b>all</b> fields! ";？有没有成功运行程序的建议？在插入isset()函数之前，代码运行成功。谁能解释一下？任何建议或任何代码结构？我正在尝试为办公室创建一个登录注册系统。

我是Php的新手。代码中包含使用的完整html。

谢谢

下面的PHP代码是输出错误的原始代码：

（！）注意：未定义的索引：在第4行的C：\ wamp \ www \ registerloginsystem \ register.php中提交

（！）注意：未定义的索引：第6行的C：\ wamp \ www \ registerloginsystem \ register.php中的fullname

注意：未定义的索引：第7行的C：\ wamp \ www \ registerloginsystem \ register.php中的用户名

注意：第9行的C：\ wamp \ www \ registerloginsystem \ register.php中的未定义索引：密码

注意：第10行的C：\ wamp \ www \ registerloginsystem \ register.php中的未定义索引：repeatpassword

<?php
echo "<h1>Register</h1>";

$submit = $_POST['submit'];

$fullname = strip_tags($_POST['fullname']);
$username = strip_tags($_POST['username']);

$password = strip_tags($_POST['password']);
$repeatpassword = strip_tags($_POST['repeatpassword']);
$date = date("Y-m-d");

  if ($submit)
    {
     //check for existence
  if ($fullname&&$username&&$password&&$repeatpassword)
    {
    # code...
    // encrypt password
    $password = md5($password);
    $repeatpassword = md5($repeatpassword); 

    if ($password==$repeatpassword)
    {
    # code...
        // Check char length of username and fullname   
    if (strlen($username)>25||strlen($fullname)>25)
    {
    echo "Length of username or fullname is too long!";
    }
    else
        //check password length
                        {
    if (strlen($password)>25||strlen($password)<6)
    {
    echo "Password must be between 6 and 25 characters";
    }
    else
    {
    // register the user!
    }   
    }
    }
    else 
    echo "Your passwords do not match!";
    }
    else
    {
    echo "Please fill in <b>all</b> fields! ";      
    }
    }
?>




<!DOCTYPE html>
<html>

<body>
<p>
<form action='register.php' method="POST">
<table>
<tr>
    <td>
    Your full name:
    </td>   
    <td>            
    <input type="text" name="fullname">
    </td>   
    </tr>
    <tr>
    <td>
    Choose a username:
    </td>   
    <td>            
    <input type="text" name="username">
    </td>   
    </tr>
    <tr>
    <td>
    Choose a password:
    </td>   
    <td>            
    <input type="password" name="password"> 
    </td>   
    </tr>
    <tr>
    <td>
    Repeat your password:
    </td>   
    <td>            
    <input type="password" name="repeatpassword">
    </td>   
    </tr>
</table>
<p>     
<input type="submit" name="submit" value="Register" >
</form>
</body>
</html>

Answer 1

您的代码结构不合理。我建议这样的事情：

<?php

     $submit = isset($_POST['submit']);
     if($submit)
     {
        if(empty($_POST['fullname']) || empty($_POST['username']) || empty($_POST['password']) || empty($_POST['repeatpassword']))
        {
           echo "Please fill in all fields!";
        }else{
           /** continue
           *   with
           *   registration
           **/

           //like strip tags in input e.t.c
        }
    }
?>

Answer 2

尝试使用empty()，如下所示：

<?php
echo "<h1>Register</h1>";

if(!empty($_POST)){
  $submit = isset($_POST['submit']);

  $fullname = strip_tags(isset($_POST['fullname']));
  $username = strip_tags(isset($_POST['username']));

  $password = strip_tags(isset($_POST['password']));
  $repeatpassword = strip_tags(isset($_POST['repeatpassword']));
}

$date = date("Y-m-d");

if ($submit)
{
    if (!empty($fullname) && !empty($username) && !empty($password) && !empty($repeatpassword))
    {


    }
    else
        echo "Please fill in <b>all</b> fields! ";  
}

?>

<?php
echo "<h1>Register</h1>";

if(!empty($_POST)){
  $submit = $_POST['submit'];

  $fullname = strip_tags($_POST['fullname']);
  $username = strip_tags($_POST['username']);

  $password = strip_tags($_POST['password']);
  $repeatpassword = strip_tags($_POST['repeatpassword']);
}

$date = date("Y-m-d");

  if ($submit)
    {
     //check for existence
  if (!empty($fullname) && !empty($username) && !empty($password) && !empty($repeatpassword))
    {
    # code...
    // encrypt password
    $password = md5($password);
    $repeatpassword = md5($repeatpassword); 

    if ($password==$repeatpassword)
    {
    # code...
        // Check char length of username and fullname   
    if (strlen($username)>25||strlen($fullname)>25)
    {
    echo "Length of username or fullname is too long!";
    }
    else
        //check password length
                        {
    if (strlen($password)>25||strlen($password)<6)
    {
    echo "Password must be between 6 and 25 characters";
    }
    else
    {
    // register the user!
    }   
    }
    }
    else 
      echo "Your passwords do not match!";
    }
    else
    {
      echo "Please fill in <b>all</b> fields! ";      
    }
    }
?>

Answer 3

这是您应该检查表单是否已提交的方式。

if($_SERVER['REQUEST_METHOD'] == 'POST') {
//form handling code 
}

如果您使用的是PHP 7及以上版本，则可以检查这样的变量

$fullName = $_POST['fullname']?? null;

echo“请填写<b>所有</b>字段！”;单击注册按钮

3 个答案: