Decrementing alphabetical values

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PHP has overloaded ++ for strings; this isn’t the case for --. You can do the same thing with much cleaner code with chr, ord, and array_map:

function decrementLetter($l) {
    return chr(ord($l) - 1);
}

function move_up_left($x) {
    if($x['orientation'] === 'down') $arr = &$x[0];
    else $arr = &$x[1];

    $arr = array_map('decrementLetter', $arr);

    return $x;
}

Here’s a demo. Note that you may need to add a special case for decrementing a – I’m not sure how you want to deal with that.

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