Minor nitpick given the scope of these additions, but his use of a boolean argument to enhance implode is not my favorite. implode(',', $array, true) A new

Minor nitpick given the scope of these additions, but his use of a boolean argument to enhance implode is not my favorite. implode(',', $array, true) A new function (or even leaving it the way it was) is far more readable. implode_keys(',', $array) implode(',', array_keys($array))