Question

 // Loop $key

$key = count($_SESSION['imageURL']);

for ($i = 1; $i <= $key; $i++) {

    echo $_SESSION['imageURL'][$i];

    echo $_SESSION['clubURL'][$i];

}

Answer 1

There are several other ways:

foreach

foreach ($_SESSION['imageURL'] as $key => $image) {
    echo $image;
    echo $_SESSION['clubURL'][$key];
}

while

while (list ($key, $image) = each ($_SESSION['imageURL']) {
    echo $image;
    echo $_SESSION['clubURL'][$key];
}

do..while

if (count($_SESSION['imageURL']) {
    do {
        echo current($_SESSION['imageURL']);
        echo $_SESSION['clubURL'][key($_SESSION['imageURL'])];
    } while (next($_SESSION['clubURL']));
}

Personally, I prefer your technique with the for loop.