如何防止f5重新提交php页面

如何防止f5重新提交php页面

我很累,

我要防f5

我尝试了很多解决方案

但所有的解决方案都是无效的

请帮帮我

我尝试了header（'Location:index.php'）；但是不起作用

如果你能帮助我，请编辑我的php代码并粘贴你的代码

index.php文件中的我的表单代码：

<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>

<?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
}
}
?>

upload.php文件中的我的php代码：

<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>

<?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
}
}
?>

0）{
echo“请选择要上载的文件！”；//如果不选择文件
}
elseif（！in_数组（$extension，$allowedExts））{
echo“不允许使用此扩展名！”；//如果选择“不允许使用文件”
}
elseif（$_文件[“uploadedfile”][“size”]>5242880）{
echo“大文件！”；//如果选择大文件
}
}
?>

谢谢。

您可以在表单中将a设置为隐藏值，并在最初提供页面时将其存储在数据库中。当您收到第一次表单提交时，请将该nonce标记为已使用。然后，如果您在相同的时间内收到更多的提交，您将知道表单已重新提交，以便您可以采取适当的措施

希望这有帮助。

试试这个

session_start();
if( strcasecmp($_SERVER['REQUEST_METHOD'],"POST") === 0) {       
  $_SESSION['postdata'] = $_POST;
  header("Location: ".$_SERVER['PHP_SELF']."?".$_SERVER['QUERY_STRING']); exit;
}

if( isset($_SESSION['postdata'])) { 
  $_POST = $_SESSION['postdata'];      
  unset($_SESSION['postdata']); 
}

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来源：

使用会话变量…

我尝试了header（'Location:index.php'）；但是不起作用为什么不？发生什么事了？我不知道为什么不工作！！这比破坏浏览器功能要好得多，这会损害可用性。