gistfile1.php

<?php

    public function fn(array $options)
    {
        $this->parametrize($options, [['w', 'width'], ['h', 'height'], 'x', 'y']);
    }

    public function parametrize($options, $validOptions)
    {
        foreach ($options as $key => $value) {
            if (in_array($key, $validOptions)) {
                continue;
            }
            foreach ($validOptions as $index => $possibility) {
                if (is_array($possibility) && in_array($key, $possibility)) {
                    unset($options[$key]);
                    $key = reset($validOptions[$index]);
                    $options[$key] = $value;
                    break;
                }
            }
        }

        return $options;
    }