laravel/system/input.php

<?php namespace System;

class Input {

	/**
	 * The input data for the request.
	 *
	 * @var array
	 */
	public static $input;

	/**
	 * Determine if the input data contains an item or set of items.
	 *
	 * @return bool
	 */
	public static function has()
	{
		foreach (func_get_args() as $key)
		{
			if (is_null($value = static::get($key)) or trim((string) $value) == '')
			{
				return false;
			}
		}

		return true;
	}

	/**
	 * Get an item from the input data.
	 *
	 * @param  string  $key
	 * @param  mixed   $default
	 * @return string
	 */
	public static function get($key = null, $default = null)
	{
        // -----------------------------------------------------
        // Has the input data been hydrated for the request?
        // -----------------------------------------------------
		if (is_null(static::$input))
		{
			static::hydrate();
		}

		return static::from_array(static::$input, $key, $default);
	}

	/**
	 * Determine if the old input data contains an item.
	 *
	 * @param  string  $key
	 * @return bool
	 */
	public static function has_old($key)
	{
		return ( ! is_null(static::old($key)));
	}

	/**
	 * Get input data from the previous request.
	 *
	 * @param  string  $key
	 * @param  mixed   $default
	 * @return string
	 */
	public static function old($key = null, $default = null)
	{
		if (Config::get('session.driver') == '')
		{
			throw new \Exception("Sessions must be enabled to retrieve old input data.");
		}

		return static::from_array(Session::get('laravel_old_input', array()), $key, $default);
	}

	/**
	 * Get an item from an array. If no key is specified, the entire array will be returned.
	 *
	 * @param  array   $array
	 * @param  string  $key
	 * @param  mixed   $default
	 * @return string
	 */
	private static function from_array($array, $key, $default)
	{
		if (is_null($key))
		{
			return $array;
		}

		return (array_key_exists($key, $array)) ? $array[$key] : $default;
	}

	/**
	 * Hydrate the input data for the request.
	 *
	 * @return void
	 */
	public static function hydrate()
	{
		switch (Request::method())
		{
			case 'GET':
				static::$input =& $_GET;
				break;

			case 'POST':
				static::$input =& $_POST;
				break;

			case 'PUT':
			case 'DELETE':
				// ----------------------------------------------------------------------
				// Typically, browsers do not support PUT and DELETE methods on HTML
				// forms. So, we simulate them using a hidden POST variable.
				//
				// If the request method is being "spoofed", we'll move the POST array
				// into the PUT / DELETE array.
				// ----------------------------------------------------------------------
				if (isset($_POST['request_method']) and ($_POST['request_method'] == 'PUT' or $_POST['request_method'] == 'DELETE'))
				{
					static::$input =& $_POST;
				}
				// ----------------------------------------------------------------------
				// If the request is a true PUT request, read the php://input file.
				// ----------------------------------------------------------------------
				else
				{
					parse_str(file_get_contents('php://input'), static::$input);
				}
		}
	}

}