Wrong submit buttons get sent in POST with PHP script - php

Question

My PHP form uses multiple submit buttons that I use for A/B processing
Occasionally, the wrong submit buttons get passed on even though they are not the ones clicked. The buttons look like this:
<form method="post" action="url..." autocomplete="off">
... fields...
<input type="submit" name="UpdateExit" value="Exit" />
<input type="submit" name="UpdateSave" value="Save" />
<input type="submit" name="InsertNew" value="Insert new" />
<input type="submit" name="Delete" value="Delete" />
<input type="button" name="Cancel" value="Cancel" />
</form>
Sometimes the var_dump($_POST) shows both UpdateExit and UpdateSave even though i clicked InsertNew! Needless to say it messes up the output. Then "the right button" is sent.
I narrowed down this behavior to webkit browsers and the first time I use the form after clearing my browser's cache, then it seems to "come back to normal". This is empirical and I cannot say it's PHP or HTML related. but I have been struggling with this for the better part of the day and found no spot on info on SO or elsewhere :(
Anyone heard/encountered a similar behavior?

Answer 1

Try:
<form method="post" action="url..." autocomplete="off">
... fields...
<input type="submit" name="UpdateExit" value="Exit" />
<input type="submit" name="UpdateSave" value="Save" />
<input type="submit" name="InsertNew" value="Insert new" />
<input type="submit" name="Delete" value="Delete" />
<input type="submit" name="Cancel" value="Cancel" />
</form>
Handle Cancel logic as you would any of the other submit buttons.
PHP Form Handler Logic:
<?php
if (isset($_POST['UpdateExit'])) {
//Do something based on Update and Exit was used
}
elseif (isset($_POST['UpdateSave'])) {
//Do something based on Update and Save was used
}
elseif (isset($_POST['InsertNew'])) {
//Do something based on Insert New was used
}
elseif (isset($_POST['Delete'])) {
//Do something based on Delete was used
}
else {
//Do something because Cancel was used...
}
?>