如何防止F5重新提交php页面 [英] how to prevent f5 resubmitting php page

问题描述

如何防止f5重新提交php页面?

how to prevent f5 resubmitting php page?

我很累

我要阻止f5！

我尝试了很多解决方案

但所有解决方案均无效！

but all solutions is invalid!

请帮助我

我尝试过头文件('Location:index.php');但不起作用！

i tried header('Location: index.php'); but not working!

如果可以帮助我，请编辑我的php代码并粘贴您的代码.

if you can help me, please edit my php code and paste your code..

我在index.php文件中的表单代码:

My form code in index.php file:

<form id="uploadedfile" enctype="multipart/form-data" action="upload.php" method="POST">
<input name="uploadedfile" type="file" />
<input type="submit" value="upload" id="submit" name="submit" />
</form>

upload.php文件中的我的php代码:

My php code in upload.php file:

<?php
$allowedExts = array("gif", "jpeg", "jpg", "png", "zip", "pdf", "docx", "rar", "txt", "doc");
$temp = explode(".", $_FILES["uploadedfile"]["name"]);
$extension = end($temp);
$newname = $extension.'_'.substr(str_shuffle(str_repeat("0123456789abcdefghijklmnopqrstuvwxyz", 7)), 4, 7);
$imglink = 'imgs/file_';
$uploaded = $imglink .$newname.'.'.$extension;
if(isset($_FILES["uploadedfile"])){
header('Location: index.php'); 
if ((($_FILES["uploadedfile"]["type"] == "image/jpeg")
|| ($_FILES["uploadedfile"]["type"] == "image/jpeg")
|| ($_FILES["uploadedfile"]["type"] == "image/jpg")
|| ($_FILES["uploadedfile"]["type"] == "image/pjpeg")
|| ($_FILES["uploadedfile"]["type"] == "image/x-png")
|| ($_FILES["uploadedfile"]["type"] == "image/gif")
|| ($_FILES["uploadedfile"]["type"] == "image/png")
|| ($_FILES["uploadedfile"]["type"] == "application/msword")
|| ($_FILES["uploadedfile"]["type"] == "text/plain")
|| ($_FILES["uploadedfile"]["type"] == "application/vnd.openxmlformats-officedocument.wordprocessingml.document")
|| ($_FILES["uploadedfile"]["type"] == "application/pdf")
|| ($_FILES["uploadedfile"]["type"] == "application/x-rar-compressed")
|| ($_FILES["uploadedfile"]["type"] == "application/x-zip-compressed")
|| ($_FILES["uploadedfile"]["type"] == "application/zip")
|| ($_FILES["uploadedfile"]["type"] == "multipart/x-zip")
|| ($_FILES["uploadedfile"]["type"] == "application/x-compressed")
|| ($_FILES["uploadedfile"]["type"] == "application/octet-stream"))
&& ($_FILES["uploadedfile"]["size"] < 5242880) // Max size is 5MB
&& in_array($extension, $allowedExts))
{   
move_uploaded_file($_FILES["uploadedfile"]["tmp_name"],
$uploaded );
include 'upload.html';
}
if($_FILES["uploadedfile"]["error"] > 0){
echo '<h3>Please choose file to upload it!</h3>'; // If you don't choose file
}
elseif(!in_array($extension, $allowedExts)){
echo '<h3>This extension is not allowed!</h3>'; // If you choose file not allowed
}
elseif($_FILES["uploadedfile"]["size"] > 5242880){
echo "Big size!"; // If you choose big file
}
}
?>

谢谢.

推荐答案

您可以设置 nonce 作为表单中的隐藏值，并在最初为页面提供服务时将其存储在数据库中.当您收到第一个表单提交时，将该随机数标记为已使用.然后，如果您收到更多具有相同随机数的提交，您将知道该表单已重新提交，因此您可以采取适当的措施.

You could set a nonce as a hidden value in the form, and store it in your database when you initially serve the page. When you receive the first form submission, mark that nonce as used. Then if you receive more submissions with the same nonce, you'll know the form has been resubmitted so you can take appropriate action.

这篇关于如何防止F5重新提交php页面的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！