PHP 验证。它不会去显示页面

Question

我是 PHP 和验证的新手。我的讲师要求我制作一个带有会话的表格并且 validation.I 有 3 php 个页面，例如 pbt1.php , pbt2.php and validation.php 全部验证后，它将转到显示页面。但是，它似乎只停在验证页面 [validation.php]。我也需要有人检查我的代码是否正确。 pbt1.php

session_start();
?>
<html>
<?php

if(isset($_SESSION['pbt1']))
{
    $nameError      =   $_SESSION['pbt1']['nameError'];  
    $numberError    =   $_SESSION['pbt1']['numberError'];
    $cityError      =   $_SESSION['pbt1']['cityError'];
    $addressError   =   $_SESSION['pbt1']['addressError'];
    $zipcodeError   =   $_SESSION['pbt1']['zipcodeError'];
    $dateError      =   $_SESSION['pbt1']['dateError'];
}
?>

<style>
.registrationform 
{
    padding: 20px;
    margin: auto;
    margin-top: 20px;
    line-height: 30px;
    width: 600px;
    border: solid 3px red;   
}

Label
{
    width:200px;
    display:inline-block;
}

</style>

    <div class= "registrationform">

        <h1>ONLINE MARATHON REGISTRATION</h1>
        <br><br>

        <form name = "pbt1" method = "post" action = "validation.php">
        
        <Label>Name<span style="color: red;">*</span>: </Label>
        <input type = "text" name = "name">
        <span id = "warning" style="color: red;" > <?php echo isset($nameError)?$nameError :'';?></span>
        <br><br>

        <Label>Gender <span style="color: red;">*</span>:</Label> 
        <input type = "radio" name = "gender" value = "Female" required>Female
        <input type = "radio" name = "gender" value = "Male" required>Male
        <br><br>

        <Label>Date Of Birth <span style="color: red;">*</span>:</Label> 
        <input type = "date" name = "date">
        <span id = "warning" style="color: red;"><?php echo isset($dateError)?$dateError:'';?></span>
        <br><br>

        <Label>Contact Number <span style="color: red;">*</span>:</Label> 
        <input type = "text" name = "phonenumber">
        <span id = "warning" style="color: red;"><?php echo isset($numberError)?$numberError:'';?></span>
        <br><br>

        <Label>Address <span style="color: red;">*</span>:</Label>
        <input type = "text" name = "address" >
        <span id = "warning" style="color: red;"><?php echo isset($addressError)?$addressError :'';?></span>
        <br><br>

        <Label>City <span style="color: red;">*</span>:</Label> 
        <input type = "text" name = "city" >
        <span id = "warning" style="color: red;"><?php echo isset($cityError)?$cityError:'';?></span>
        <br><br>

        <Label>Zip Code <span style="color: red;">*</span>:</Label> 
        <input type = "text" name = "zipcode" >
        <span id = "warning" style="color: red;"><?php echo isset($zipcodeError)?$zipcodeError:'';?></span>
        <br><br>

        <div style="text-align:center;">
        <input type = "submit" value = "Submit" name="Submit">
        </div>
        </form>
        
    </div>

    <br><br>
</html>

pbt2.php

<?php
session_start();
?>
<html>
<style>
    table 
{
    text-align:center;
}
</style>



<div style="background-color:cyan;">

<h1 align = 'center'> YOUR INFORMATION AS THE TABLE BELOW </h1>

<table width = '400' border = '1' align = 'center'>
    <tr>
        <td>Name</td>
        <td><?php echo $_SESSION['Userdata']['name'];?></td>
    </tr>
    <tr>
        <td>Phone Number</td>
        <td><?php echo $_SESSION['Userdata']['phonenumber'];?></td>
    </tr>
    <tr>
        <td>Address</td>
        <td><?php echo $_SESSION['Userdata']['address'];?></td>
    </tr>
    <tr>
        <td>City</td>
        <td><?php echo $_SESSION['Userdata']['city'];?></td>
    </tr>
    <tr>
        <td>Zip Code</td>
        <td><?php echo $_SESSION['Userdata']['zipcode'];?></td>
    </tr>
    <tr>
        <td>Gender</td>
        <td><?php echo $_SESSION['Userdata']['gender'];?></td>
    </tr>
    <tr>
        <td>Date</td>
        <td><?php echo $_SESSION['Userdata']['date'];?></td>
    </tr>
</table>

</div>
</html>

validation.php

<?php
session_start();

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

    $name = $_POST['name'];
    if(isset($name) && empty($name))
    {
        $_SESSION['pbt1']['nameError']="Name must be required!";
        header('location:pbt1.php');  
        
    }
    else
    {
        if(!preg_match("/^[a-zA-Z ]*$/",$name))
        {
            $_SESSION['pbt1']['nameError'] = "Only letters and white space allowed";
            header('location:pbt1.php');  
            
        }   
    }

    $phonenumber = $_POST['phonenumber'];
    if(isset($phonenumber) && empty($phonenumber))
        {
            $_SESSION['pbt1']['numberError'] = "Error, insert phone number";
            header('location:pbt1.php');  
            
        }
    else 
        {
            if(!preg_match('/^([0-9]*)$/', $phonenumber))
            {
                $_SESSION['pbt1']['numberError'] = "Numbers only";
                header('location:pbt1.php');  
                
            }
        }
    
    $address = $_POST['address'];
    if(isset($address) && empty($address))
    {
        $_SESSION['pbt1']['addressError'] = "Error, enter your address";
        header('location:pbt1.php');
        
    }

    $city = $_POST['city'];
    if(isset($city) && empty($city))
    {
        $_SESSION['pbt1']['cityError'] = "Error, enter your city";
        header('location:pbt1.php');
        
    }

    $zipcode = $_POST['zipcode'];
    if(isset($zipcode) && empty($zipcode))
    {
        $_SESSION['pbt1']['zipcodeError'] = "Error, enter your zipcode";
        header('location:pbt1.php');
        
    }
    else 
    {
        if(!preg_match('/^([0-9]*)$/', $zipcode))
        {
            $_SESSION['pbt1']['zipcodeError'] = "Numbers only";
            header('location:pbt1.php');  
            
        }
    }

    $gender = $_POST['gender'];

    $date = $_POST['date'];
    if(isset($date) && empty($date))
    {
        $_SESSION['pbt1']['dateError'] = "Error, select the date";
        header('location:pbt1.php');
    }

    $_SESSION['Userdata'] = ['name'=>$name ,'phonenumber'=>$phonenumber,'address'=>$address,'city'=>$city,
                            'zipcode'=>$zipcode,'gender'=>$gender,'date'=>$date ];

}

function test_input($data)
{
    $data = trim($data);
    $data = stripslashes($data);
    $data = htmlspecialchars($data);
    return $data;
}

if($_SESSION['pbt1']['nameError'] == "" && $_SESSION['pbt1']['numberError'] == "" && $_SESSION['pbt1']['addressError']== "" && $_SESSION['pbt1']['cityError']=="" && $_SESSION['pbt1']['zipcodeError']=="" && $_SESSION['pbt1']['dateError']=="")
    {
    header("location:pbt2.php");
    exit; }
?>

Answer 1

根据您使用的 PHP 版本 (>= 7.0)，您可以更改

<?php echo isset($nameError)?$nameError :'';?>

至

<?php echo $nameError ?? ''; ?>

至于HTML，您可能需要更改

<form name = "pbt1" method = "post" action = "validation.php">

至

<form name="pbt1" method="post" action="validation.php">

这不会改变结果，但更容易阅读。

下一步是什么...

$name = $_POST['name'];
if(isset($name) && empty($name))
{

可以改成

if (array_key_exists('name', $_POST) && trim($_POST['name']) === '') {

看起来代码更多了，但是 if 的意图变得更加清晰。

至此为止

if(isset($_SESSION['pbt1']))
{
    $nameError      =   $_SESSION['pbt1']['nameError'];  
    $numberError    =   $_SESSION['pbt1']['numberError'];
    $cityError      =   $_SESSION['pbt1']['cityError'];
    $addressError   =   $_SESSION['pbt1']['addressError'];
    $zipcodeError   =   $_SESSION['pbt1']['zipcodeError'];
    $dateError      =   $_SESSION['pbt1']['dateError'];
}

...不要相信您的会话。我会把它改成

if (array_key_exists('pbt1', $_SESSION)) {
    $nameError    = $_SESSION['pbt1']['nameError'] ?? '';  
    $numberError  = $_SESSION['pbt1']['numberError'] ?? '';
    $cityError    = $_SESSION['pbt1']['cityError'] ?? '';
    $addressError = $_SESSION['pbt1']['addressError'] ?? '';
    $zipcodeError = $_SESSION['pbt1']['zipcodeError'] ?? '';
    $dateError    = $_SESSION['pbt1']['dateError'] ?? '';
}

这个

    $_SESSION['Userdata'] = ['name'=>$name ,'phonenumber'=>$phonenumber,'address'=>$address,'city'=>$city,
                            'zipcode'=>$zipcode,'gender'=>$gender,'date'=>$date ];

我会改成

    $_SESSION['Userdata'] = [
        'name'        => $_POST['name'] ?? '', 
        'phonenumber' => $_POST['phonenumber'] ?? '',
        'address'.    => $_POST['address'] ?? '',
        'city'.       => $_POST['city'] ?? '',
        'zipcode'     => $_POST['zipcode'] ?? '',
        'gender'.     => $_POST['gender'] ?? '',
        'date'.       => $_POST['date'] ?? '',
    ];

因为validation.php是纯粹的PHP，去掉

?>

在文件末尾。

还有什么... 在 validation.php 的开头，确保清除 $_SESSION['pbt1'] aka.

unset($_SESSION['pbt1']);

与其在每个问题之后都执行 header('location:pbt1.php');，不如从每个单独的 if 块中删除 header('location:pbt1.php'); 并将其放在末尾，如

if(isset($date) && empty($date)) {
    $_SESSION['pbt1']['dateError'] = "Error, select the date";
    // header('location:pbt1.php');
}

if (array_key_exists('pbt1', $_SESSION)) {
    header('location:pbt1.php');
    exit;
}

    $_SESSION['Userdata'] = ...

这样您就不必自己修复每个错误，而是一次显示所有错误。

PHP 验证。它不会去显示页面

PHP Validation. It won't go to display page

html

php

forms

validation