That's because you are refreshing the Form page submit.
It is working like this:
$_SESSION['custom_flash_message']
is created.wp_redirect
redirects us back to the Form page.$_SESSION['custom_flash_message']
.All good so far.
But when you "refresh" the page you are not actually refreshing the Form page.
You are refreshing the Post page.
The wp_redirect just makes it look like you are refreshing the Form page.
So you are actually refreshing back to step 2 and recreating the$_SESSION['custom_flash_message']
.
Try just clicking on the URL in the browser location bar and hit enter.
This will reload the Form page, but without a redirect.
You will see the$_SESSION['custom_flash_message']
was destroyed.
You can stop this by adding a unique id in the form and testing for it on the Post page.
Add a hidden element in your Form page:
<input type="hidden" name="formId" value = "<?php echo uniqid(); ?>">
This $_POST['formId'] will be unique every time the form is submitted.
Then change your creation code to:
If ( $_POST['formId'] != $_SESSION['formId'] ) {
$_SESSION['custom_flash_message'] = json_encode( array(
'class' => 'success',
'message' => 'Changes Saved Successfully !'
) );
$_SESSION['formId'] = $_POST['formId'];
}
Now the Post page will only create the message from a fresh form. If you refresh the page it sends the same formId and the message is not created.
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