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I am trying to prevent multiple form submits. I have implemented the following php code, which works for devices that use Chrome, Firefox or IE as a browser:

Setup - On load - Custom code

 if(isset( $_SESSION['subcounter'] ))
      header("Refresh:0; url=https://homepage.net"); 

Setup - On submit - Custom code

session_start();
$_SESSION['subcounter'] =1;

​
​
The code above is defeated when a form is submitted from an iOS device such as an iPhone, Mac or iPad.
I have also implemented a submit limit along with the php code above, which is also defeated when using an iOS device.
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Any ideas?

Did you try to use v7 ?