Request.php

<?php
	/**
	 * Get a subset of the items from the input data.
	 *
	 * @param  array  $keys
	 * @return array
	 */
	public function only($keys)
	{
		$keys = is_array($keys) ? $keys : func_get_args();

		$input = $this->input();

		$results = array_only($input, $keys);

		return array_merge(array_fill_keys($keys, null), $results);
	}
?>