Question

I am trying to reassign a global variable (in this case ‘$aDoor’) by doing ($checkbox = $data;) on line 8. Not sure how to solve this and would love some help!

$checkboxes = array($aDoor,$bro);

foreach ($checkboxes as $checkbox => $checkdata) {
    $data = '';
    foreach ($checkdata as $check) {
        $data .= $check . ", ";
    }
    $checkbox = $data;
    echo $data;
}
echo $aDoor;

Answer 1

You need to work by reference. Throw in some ampersands:

$aDoor = array("hi", "hi2");
$bro = array("bye", "bye2");
$checkboxes = array(&$aDoor, &$bro);
//& means modifications to $checkbox[0] will also change $aDoor
//vs. just making a copy of $aDoor

foreach ($checkboxes as &$checkbox) { //same here
    $checkbox = implode(",", $checkbox);
}
print($aDoor);

Also, implode is a far simpler method of joining together an array.