Yet another recursive implementation, without if-else hell and with multiple parameters just like the original.

<?php
function recursiveDiff() {
    $arrs = func_get_args();
    $diff = call_user_func_array('array_diff_assoc', $arrs);

    foreach($diff as $key => $value) {
        if (!is_array($value))
            continue;

        $children = array_map(function($arr) use($key){
            return $arr[$key];
        }, $arrs);

        $diff[$key] = call_user_func_array(__FUNCTION__, $children);
    }

    return $diff;
}