Multidomain with RealURL #TYPO3

realurl_conf.php

<?php
/*
	assuming the following folder structure:
	typo3conf/
	|
	L ext/
	L domainconfig/
	  |
	  L domain-global.inc.php
	  L domain-de.inc.php
	  L domain-[country].inc.php
	  L different-a.inc.php
	  L different-b.inc.php
	L localconf.php
	L realurl_conf.php
	L temp_*

	a domainconfig include file will look like:
	php-start-tag
	$TYPO3_CONF_VARS['EXTCONF']['realurl']['domain-a.dev'] = $TYPO3_CONF_VARS['EXTCONF']['realurl']['_DEFAULT'];
	$TYPO3_CONF_VARS['EXTCONF']['realurl']['domain-a.dev']['pagePath']['rootpage_id'] = 248;
	$TYPO3_CONF_VARS['EXTCONF']['realurl']['domain-a.dev']['pagePath']['errorpage_id'] = 1309;
	
	$TYPO3_CONF_VARS['EXTCONF']['realurl']['www.domain-a.com'] = $TYPO3_CONF_VARS['EXTCONF']['realurl']['_DEFAULT'];
	$TYPO3_CONF_VARS['EXTCONF']['realurl']['www.domain-a.com']['pagePath']['rootpage_id'] = 248;
	$TYPO3_CONF_VARS['EXTCONF']['realurl']['www.domain-a.com']['pagePath']['errorpage_id'] = 1309;
	
	$TYPO3_CONF_VARS['EXTCONF']['realurl']['domain-a.com'] = $TYPO3_CONF_VARS['EXTCONF']['realurl']['_DEFAULT'];
	$TYPO3_CONF_VARS['EXTCONF']['realurl']['domain-a.com']['pagePath']['rootpage_id'] = 248;
	$TYPO3_CONF_VARS['EXTCONF']['realurl']['domain-a.com']['pagePath']['errorpage_id'] = 1309;
	php-end-tag

*/

// this is the main content of the realurl_conf.php
// a lot of common config values had been removed
// there is plenty of room for optimization

$TYPO3_CONF_VARS['FE']['addRootLineFields'].= ',tx_realurl_pathsegment';
$TYPO3_CONF_VARS['EXTCONF']['realurl'] = array(
	'_DEFAULT' => array(
		'init' => array(
			'enableCHashCache' => 1,
			'appendMissingSlash' => 'ifNotFile',
			'enableUrlDecodeCache' => 1,
			'enableUrlEncodeCache' => 1,
			'enableUrlEncodeHash' => 1,
			'postVarSet_failureMode' => '',
		),
		'redirects' => array(),
		'preVars' => array(
			array(
				'GETvar' => 'no_cache',
					'valueMap' => array(
						'nc' => 1,
					),
					'noMatch' => 'bypass',
				),
				array(
					'GETvar' => 'L',
					'valueMap' => array(
						'de' => '0',
						'fr' => '1',
						'en' => '2',
						'it' => '3'
					),
					'valueDefault' => 'de',
					'noMatch' => 'bypass',
				),
			),
			'pagePath' => array(
				'type' => 'user',
				'userFunc' => 'EXT:realurl/class.tx_realurl_advanced.php:&tx_realurl_advanced->main',
				'spaceCharacter' => '-',
				'languageGetVar' => 'L',
				'expireDays' => 7,
				'rootpage_id' => 248,
				'firstHitPathCache' => 1,
			),
			'fixedPostVars' => array(),
			'postVarSets' => array(
				'_DEFAULT' => array(
                                   // removed a lof config ...
                                ),
   
			),
		),
		// configure filenames for different pagetypes
		'fileName' => array(
			'defaultToHTMLsuffixOnPrev' => 1,
			'index' => array(
				'print.html' => array(
					'keyValues' => array(
						'type' => 98,
					),
				),
			   
			),
		),
	),
);



// MULTI-DOMAIN HANDLING
// enter new domains here
$domainCfg = array(

    'global' => array('dev-a.local','domain-a.com','www.domain-a.com'),
    'domain-ch' => array('dev-ch.local','ch.domain.com'),
    'domain-de' => array('dev-de.local','de.local.com'),
    'domain-it' => array('dev-it.local','it.local.com'),

    'different-a' => array('different-a.ch','www.different-a.ch','different-a.local'),
    'different-b' => array('different-b.ch','www.different-b.ch','different-b.local' ),

);

$includeKey = '';

foreach ($domainCfg as $key => $domain) {
    if (in_array($_SERVER['HTTP_HOST'], $domain)) {
		$includeKey = $key;
		break;
	}
}

if ( $includeKey != '' ) {
    // include the specific config-file
    $file = 'typo3conf/domainconfig/'.$includeKey.'.inc.php';
  	require_once ($file);    
}


/*
 * -------------------------------------------------------------
 * MULTI-LANGUAL ERROR PAGE HANDLING
 * -------------------------------------------------------------
 * # 'de' => '0', 'fr' => '1', 'en' => '2', 'it' => '3',
 * -------------------------------------------------------------
 */
$tmpL = false;
$langshort = substr($_SERVER['REQUEST_URI'], 0, 4);
switch ($langshort) {
	case '/fr/':
		$tmpL = 1;
	break;
	case '/en/':
		$tmpL = 2;
	break;
	case '/it/':
		$tmpL = 3;
	break;
	default:
		$tmpL = 0;
}

$TYPO3_CONF_VARS['FE']['pageNotFound_handling'] = 'http://'.$_SERVER['HTTP_HOST'].'/index.php?id='.$TYPO3_CONF_VARS['EXTCONF']['realurl'][$_SERVER['HTTP_HOST']]['pagePath']['errorpage_id'].( $tmpL ? '&L='.$tmpL : '' );
$TYPO3_CONF_VARS['FE']['pageNotFound_handling_statheader'] = 'HTTP/1.1 404 Not Found';