[Solved] php ‘ISSET’ function not working. OR the code skips my if statements

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In addition to the supplied answer(s), I would like to suggest doin the following:

// Before anything else, start your session
if (!isset($_SESSION)) {
    session_start();
}

// Next, check if your form is actually submitted
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    if (isset($_POST['...'])) {

    } elseif (isset($_POST['...'])) {

    }
}
?>

<!-- Keep PHP and html seperated -->
<form>
...
</form>

By looking at your form, i notice that you are using type="button". I suggest one of the following:

<input type="submit" ... />

<button type="submit">...</button>

solved php ‘ISSET’ function not working. OR the code skips my if statements