把'（！isset“）标签放在一个已经编码好的processform.php中

Question

你好，我想包括一个脚本，防止用户多次提交到目前为止好哟 正在工作，用户在提交一次后重定向到destination.html，但即使他得到了错误信息，我也能得到所有信息。所以问题是这个我不知道究竟在哪里放这个代码或用它来满足我的需求：

if (!isset($_SESSION['validsubmit']) || !$_SESSION['validsubmit']) { 
     echo "ERROR: Invalid form submission, or form already submitted!"; 
    } else { 
     $_SESSION['validsubmit'] = false; 

    } 

在我的理线的PHP这里的形式shoren版本：

<?php 
session_start(); 

require_once('formvalidator.php'); 

if(isset($_POST['form_btn'])) { 
    $validator = new simple_fv; 

    // fields info container 
    $fields = array(); 

    // fill the container with fields data 
    $fields[] = array('index'=>'name', 'label'=>'Name', 'required'=>true, 'max_len'=>25); 
    $fields[] = array('index'=>'surname', 'label'=>'surname', 'required'=>true, 'max_len'=>30); 
    $indexes[] = array('index'=>'email', 'label'=>'E-mail', 'required'=>true, 'type'=>'email', 'max_len'=>200); 
     $fields[] = array('index'=>'phone', 'label'=>'phone number', 'required'=>true, 'type'=>'int', 'min_len'=>4); 

    // validate the fields 
    $validator->formHandle($fields); 

    // get errors 
    $error = $validator->getErrors(); 

    // if errors is not FALSE - print the succesfull message 

if($error) {echo $error;} 
else {if(isset($_POST['name'])) 

$emotion = $_POST['emotion']; 

if($emotion == 'Basic Pack') { 
session_start(); 
$_SESSION['form_finished'] = true; 
header('Location: /destination/basicc.php'); 
} elseif($emotion == 'Deluxe Pack') { 
header('Location: html6.php'); 
} elseif($emotion == 'Premium Pack') { 
header('Location: html7.php'); 
} 

$to = 'myemail@gmail.com'; 
    $subject = 'NEWLOGO CLIENT FORM'; 
    $headers = 'From: ' . $_POST['email'] . "\r\n" . 'Reply-To: ' . $_POST['email'];  

    $message = 'Name: ' . $_POST['name'] . "\n" . 
       'Surname: ' . $_POST['surname'] . "\n" . 
       'E-mail: ' . $_POST['email'] . "\n" . 
       'Phone: ' . $_POST['phone']. "\n" . 


        mail($to, $subject, $message, $headers); 
    if($_POST['copy'] == 'on') 
    { 
     mail($_POST['email'], $subject, $message, $headers); 
    } } 

} 
?> 

我想使它在第一次提交用户转到我的redictet页面，但在第二次不只是显示此回声"ERROR: Invalid form submission, or form already submitted!"和电子邮件需要不发送在这种情况下。

Answer 1

应立即检查它，你检查之后是否发生了表单提交：

if (isset($_POST['form_btn'])) { 
    if (!isset($_SESSION['validsubmit']) || !$_SESSION['validsubmit']) { 
     echo "ERROR: Invalid form submission, or form already submitted!"; 
    } 
    else { 
     $_SESSION['validsubmit'] = false; 
     $validator = new simple_fv; 
     // ... 
    } 
}