A simple, easy-to-type, default-value, input class for PHP

i.full.php

<?php
/**
 * Here is a non-magic-method version for those that need better auto-complete and faster access times.
 * It also filters the input to be valid UTF-8 just when needed thanks to phunction.
 */
class input
{
	public static $encoding = 'UTF-8';

	public static function server($key, $default = NULL, $control = true)
	{
		return isset($_SERVER[$key]) ? self::filter($_SERVER[$key], $control) : $default;
	}

	public static function post($key, $default = NULL, $control = true)
	{
		return isset($_POST[$key]) ? self::filter($_POST[$key], $control) : $default;
	}

	public static function get($key, $default = NULL, $control = true)
	{
		return isset($_GET[$key]) ? self::filter($_GET[$key], $control) : $default;
	}

	public static function cookie($key, $default = NULL, $control = true)
	{
		return isset($_COOKIE[$key]) ? self::filter($_COOKIE[$key], $control) : $default;
	}

	public static function session($key, $default = NULL, $control = true)
	{
		return isset($_SESSION[$key]) ? self::filter($_SESSION[$key], $control) : $default;
	}

	public static function files($key, $default = NULL, $control = true)
	{
		return isset($_FILES[$key]) ? self::filter($_FILES[$key], $control) : $default;
	}

	public static function request($key, $default = NULL, $control = true)
	{
		return isset($_REQUEST[$key]) ? self::filter($_REQUEST[$key], $control) : $default;
	}

	public static function env($key, $default = NULL, $control = true)
	{
		return isset($_ENV[$key]) ? self::filter($_ENV[$key], $control) : $default; // don't forget about getenv()!
	}

	// https://github.com/alixaxel/phunction/blob/master/phunction.php#L262
	public static function filter($data, $control = true)
	{
		if (is_array($data) === true)
		{
			$result = array();

			foreach ($data as $key => $value)
			{
				$result[self::filter($key, $control)] = self::filter($value, $control);
			}

			return $result;
		}

		else if (is_string($data) === true)
		{
			$encoding = static::$encoding;

			if (function_exists('mb_detect_encoding') === true)
			{
				$encoding = mb_detect_encoding($data, 'auto');
			}

			// Check for non-ascii characters before we invoke the slow iconv!
			if(preg_match('/[^\x00-\x7F]/S', $data))
			{
				$data = @iconv(($encoding === false) ? 'UTF-8' : $encoding, 'UTF-8//IGNORE', $data);
			}

			if($data)
			{
				return ($control === true) ? preg_replace('~\p{C}+~u', '', $data) : preg_replace(array('~\r\n?~', '~[^\P{C}\t\n]+~u'), array("\n", ''), $data);
			}

			return false;
		}

		return $data;
	}
}

input.class.php

<?php

class i
{
	public static function __callStatic($method, $args)
	{
		// Function calls are slow
		//$method = '_' . strtoupper($method);

		$types = array(
			'session' => '_SESSION',
			'post' => '_POST',
			'get' => '_GET',
			'server' => '_SERVER',
			'files' => '_FILES',
			'cookie' => '_COOKIE',
			'env' => '_ENV',
			'request' => '_REQUEST'
		);

		$method = $types[$method];

		if(isset($GLOBALS[$method][$args[0]]))
		{
			return $GLOBALS[$method][$args[0]];
		}

		return isset($args[1]) ? $args[1] : NULL;
	}
}

$_POST['item_1'] = 'value';
$_GET['item_1'] = 'value';
$_SESSION['item_1'] = 'value';
$_REQUEST['item_1'] = 'value';
$_ENV['item_1'] = 'value';
$_COOKIE['item_1'] = 'value';
$_FILES['item_1'] = 'value';
$GLOBALS['cool']['value'] = 'yes'; // Other test


header('Content-Type: text/plain');
$time = microtime(TRUE);

for ($i = 0; $i < 100; $i++)
{
	i::server('HTTP_HOST');
	i::post("item_$i");
	i::get("item_$i");
	i::session("item_$i");

	// vs
	//if(isset($_POST["item_$i"])) {}
}

print (microtime(TRUE) - $time). " ms\n";

var_dump(i::server('HTTP_HOST', 'default_if_not_found'));
var_dump(i::post("item_1", 'default_if_not_found'));
var_dump(i::get("item_1", 'default_if_not_found'));
var_dump(i::session("item_1", 'default_if_not_found'));
var_dump(i::files("item_1", 'default_if_not_found'));
var_dump(i::env("item_1", 'default_if_not_found'));
var_dump(i::cookie("item_1", 'default_if_not_found'));
var_dump(i::request("item_1", 'default_if_not_found'));
//var_dump(i::cool('value')); // FAIL! See above