How to delete POST variable upon pressing Refresh button on browser with PHP

Question

When I press the  refresh  button on my browser  it seems that   POST variable is preserved across the refresh   If I want to delete the contents of   POST what should I do  Using unset for the fields of   POST did not help   Help  Thanks

User · Answer

I see this have been answered   However  I ran into the same issue and fixed it by adding the following to the header of the php script  header  quot Pragma  no-cache quot     Post Redirect Get is a good practice no  doubt   But even without that  the above should fix the issue

User · Answer

Set an intermediate page where you change   POST variables into   SESSION  In your actual page  unset them after usage   You may pass also the initial page URL to set the browser back button

User · Answer

You can t  this is treated by the browser  not by any programming language  You can use AJAX to make the request or redirect the user to the same  or another  page

User · Answer

This will remove the annoying confirm submission on refresh  the code is self-explanatory   if   isset   SESSION     session start       if    SERVER  REQUEST METHOD       POST       SESSION  postdata       POST  unset   POST   header  Location      SERVER REQUEST URI    exit     if     SESSION  postdata       POST   SESSION  postdata    unset   SESSION  postdata

User · Answer

This is the most simple way you can do it since you can t clear   POST data by refreshing the page but by leaving the page and coming back to it again   This will be on the page you would want to clear   POST data    lt a class  btn  href  clear reload php  gt  Clear lt  a gt     button to  clear  data   Now create clear reload php   clear reload php    lt  php header  Location     SERVER  HTTP REFERER         gt    The  clear  button will direct you to this clear reload php page  which will redirect you back to the same page you were at

User · Answer

You should add the no cache directive to your header    lt  php header   Cache-Control  no-store  no-cache  must-revalidate      header   Cache-Control  post-check 0  pre-check 0   false     header   Pragma  no-cache        gt

User · Answer

In my case I have used the below trick to redirect user to the same page once the   POST operation has been done  Example  if  empty   POST  message              do your operation here     header  Location      SERVER  PHP SELF        It is a very simple trick where we are reloading the page without post variable

User · Answer

Simple PHP solution to this   if  isset   POST  aaa      echo    lt script type  text javascript  gt  location reload     lt  script gt        As the page is reloaded it will update on screen the new data and clear the   POST

User · Answer

try  unset   POST   unset   REQUEST   header  Location           it worked for me

User · Answer

How about using   POST   array    which nullifies the data  The browser will still ask to reload  but there will be no data in the   POST superglobal

User · Answer

My usual technique for this is    lt  php if    POST        errors   validate post   POST       if    errors           take action   POST             This is it  you may want to pass some additional parameters to generate visual feedback later          header  Location              exit           gt

User · Answer

The Post data can be clear with some tricks   lt  php  if   isset   SESSION         session start       if    SERVER  REQUEST METHOD       POST           SESSION  postdata       POST      unset   POST     unsetting   POST Array     header  quot Location   quot    SERVER  REQUEST URI      This will let your uri parameters to still exist     exit      gt

User · Answer

this is a common question here   Here s a link to a similar question  You can see my answer there  Why POST   39 submit  39   is set when I reload   The basic answer is to look into post redirect get  but since it is easier to see by example  just check the link above

User · Answer

To prevent users from refreshing the page or pressing the back button and resubmitting the form I use the following neat little trick    lt  php  if   isset   SESSION         session start       if    SERVER  REQUEST METHOD       POST           SESSION  postdata       POST      unset   POST       header  Location      SERVER  PHP SELF         exit      gt    The POST data is now in a session and users can refresh however much they want  It will no longer have effect on your code

User · Answer

If somehow  the problem has to do with multiple insertions to your database  on refresh   Check my answer here Unset post variables after form submission  It should help

User · Answer

I have a single form and display where I  add   delete   edit   insert   move  data records using one form and one submit button  What I do first is to check to see if the   post is set  if not  set it to nothing  then I run through the rest of the code    then on the actual   post s  I use switches and if   else s based on the data entered and with error checking for each data part required for which function is being used   After it does whatever to the data  I run a function to clear all the   post data for each section  you can hit refresh till your blue in the face it won t do anything but refresh the page and display   So you just need to think logically and make it idiot proof for your users

User · Answer

This works for me    lt  if isset   POST  oldPost       gt       lt form method  post  id  resetPost  gt  lt  form gt       lt script gt     resetPost   submit   lt  script gt   lt  endif  gt

User · Answer

The  best  way to do this is Post   Redirect   Get  http   en wikipedia org wiki Post Redirect Get  After the post send a 302 header pointing to the success page

User · Answer

The request header contains some POST data  No matter what you do  when you reload the page  the rquest would be sent again   The simple solution is to redirect to a new  if not the same  page  This pattern is very common in web applications  and is called Post Redirect Get  It s typical for all forms to do a POST  then if successful  you should do a redirect   Try as much as possible to always separate  in different files  your view script  html mostly  from your controller script  business logic and stuff   In this way  you would always post data to a seperate controller script and then redirect back to a view script which when rendered  will contain no POST data in the request header

User · Answer

I can see this is an old thread  just thought I d give my 2cents  Not sure if it would fit every scenario  but this is the method I ve been successfully using for a number of years   session start    if   POST      SESSION  oldPOST      POST   array    else   SESSION  oldPOST       POST    Doesn t really delete POST-ed values from the browser  but as far as your php script below these lines is concerned  there is no more POST variables

User · Answer

POST should only get populated on POST requests  The browser usually sends GET requests  If you reached a page via POST it usually asks you if it should resend the POST data when you hit refresh  What it does is simply that - sending the POST data again  To PHP that looks like a different request although it semantically contains the same data

[php] How to delete $_POST variable upon pressing 'Refresh' button on browser with PHP?

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