x11_detectBrowser.php

<?php
/**
 * Interpretiert den "User Agent" des Browser richtig.
 *
 * Supported Browser: Chrome, Firefox, IE, Opera, Safari
 *
 */
class x11_detectBrowser
{

	/**
	 * User agent string
	 *
	 * @var string
	 */
	private $_userAgent;
	
	/**
	 * Browser id (in the order specified)
	 *
	 * @var array
	 */
	private $_supportedBrowsers = array ('opera', 'chrome', 'msie', 'safari', 'firefox');

	/**
	 * Browser information (date: 05.09.2012)
	 *
	 * @var array
	 */
	private $_browserInfo = array(
			'unkown' => array(
				'name' => 'unkown',
				'site' => 'unkown',
				'version' => 'unkown'
			),
			'chrome' => array(
				'name' => 'Google Chrome',
				'site' => 'http://google.com/chrome',
				'version' => '21'
			),
			'firefox' => array(
				'name' => 'Mozilla Firefox',
				'site' => 'http://firefox.com',
				'version' => '15'
			),
				'msie' => array(
				'name' => 'Windows Internet Explorer',
				'site' => 'http://microsoft.com/windows/internet-explorer',
				'version' => '10'
			),
			'opera' => array(
				'name' => 'Opera',
				'site' => 'http://opera.com',
				'version' => '12'
			),
			'safari' => array(
				'name' => 'Safari',
				'site' => 'http://apple.com/safari',
				'version' => '6'
			)
	);

	/**
	 * Browser id (default: "unkown")
	 *
	 * @var string
	 */
	private $_id = 'unkown';
	
	/**
	 * Browser version (default: "unkown")
	 *
	 * @var string
	 */
	private $_version = 'unkown';
	
	
	/**
	 * Construct detectBrowser object.
	 *
	 * @param	string|null		Null or user agent string
	 */
	public function __construct( $userAgent = NULL )
	{
		if( is_empty( $userAgent ) ) {
			$userAgent = $_SERVER['HTTP_USER_AGENT'];
		}
		$this->_userAgent = strtolower($_SERVER['HTTP_USER_AGENT']);
		
		// Detect browser id
		for($i = 0; $i < count($this->_supportedBrowsers); $i++) {
			if(preg_match('/' . $this->_supportedBrowsers[$i] . '/i', $this->_userAgent)) {
				$this->_id = $this->_supportedBrowsers[$i];
				break;
			}
		}
		
		if($this->_id !== 'unkown') {
	
			// Detect browser version
			$search =  array ('version/', $this->_id . '/', $this->_id . ' ');
	 
			for($i = 0; i < count($search); $i++) {	
	 
				$version = strstr($agent, $search[$i]);
				$version = strstr($version, '.', true);
				$version = str_replace($search[$i], '', $version);
	 
				if($version !== '') {
					$this->_version = $version;
					break;
				}
			}			
		}
 	}
	
	/**
	 * Check browser version is old.
	 *
	 * @return	boolean		True, if browser version is old
	 */
	public function checkBrowserIsOld()
	{
		if($this->_version < $this->getLatestVersion()) {
			return true;
		} else {
			return false;
		}
	}
	
	/**
	 * Get user agent string.
	 *
	 * @return	string	User agent string
	 */
	public function getUserAgent()
	{
		return $this->_userAgent;
	}
	
	/**
	 * Get browser id (e.g. msie = Windows Internet Explorer).
	 *
	 * @return	string	Browser id
	 */
	public function getId()
	{
		return $this->_id;
	}
	
	/**
	 * Get browser version.
	 *
	 * @return	string	Browser version
	 */
	public function getVersion()
	{
		return $this->_version;
	}
	
	/**
	 * Get browser name.
	 *
	 * @return string	Browser name
	 */
	public function getName()
	{
		return $this->_browserInfo[$this->_id]['name'];
	}
	
	/**
	 * Get browser website.
	 *
	 * @return string 	Browser website
	 */
	public function getWebsite()
	{
		return $this->_browserInfo[$this->_id]['website'];
	}
	
	/**
	 * Get latest browser version.
	 *
	 * @return string	Latest browser version
	 */
	public function getLatestVersion()
	{
		return $this->_browserInfo[$this->_id]['version'];
	}
}