Basic Looping with 2+ incriment

gistfile1.php

<?php

    # get the number of post elements
    $count = count($_POST);

    # get our array keys
    $keys = array_keys($_POST);

    # loop through them incrimenting by 2
    # normally you would write $i++ at the end, this is shorthand for $i = $i + 1
    # so naturally if you use + 2 we go up in steps of 2!
    # you could use the shorthand $i += 2 instead! but the below works fine!
    for($i = 0; $i < $count; $i = $i + 2)
    {
        # you can now access the two pair by using:
        $first  = $_POST[$keys[$i]];
        $second = $_POST[$keys[$i + 1]];

        # the second element may not always exist (if you have an odd number, so here you could check
        # if it actually exists first!
    }


    ?>