execute php function when form is submitted

Hello, I am attempting to create a code using this PHP function:

<?php 
function generateRandomString($length = 6) {
    return substr(str_shuffle(str_repeat($x='0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ', ceil($length/strlen($x)))), 1, $length);
}

echo generateRandomString();
?>

When the

<button>Submit</button>
is clicked. It serves as a submission button for an HTML form.

Thank you in advance :)

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