Modify PHP Post Data

Question

I am using a swipe card to capture id and use that to store attendance into the database. I have a form with jQuery that automatically submits the form when a user enter 8 character string into the input field. I want to use the data from the swipe card to do this but when I swipe my card the output I get is ;910522804? where it should be k1052280.

How could I trim the data so when someone swipes their card it should get rid of ; ? and the last digit. Any help would be greatly appreciated.

The Form and jQuery code is this

<form id="SwipeForm" action="Swiped.php" method="post">
    <input id="Swipe" name="studentID" type="text" value="" />&nbsp;
    <input type="submit" value="Submit" />
</form>

<script>
$(function () {
    $('#Swipe').bind('DOMAttrModified textInput input change keyup keypress paste', function() {
        var vallength = $(this).val().length;

        if (vallength == 8) {
            $('#SwipeForm').submit();
        }
    });
});
</script>

<form id="SwipeForm" action="Swiped.php" method="post">
    <input id="Swipe" name="studentID" type="text" value="" />&nbsp;
    <input type="submit" value="Submit" />
</form>

Answer 1

Alternative you can use the strlen function with substr to get the part of your string.

$str = ';910522804?';
$str = substr($str, 1, strlen($str) - 2);
var_dump($str);