controle url bestaan

		function cleanURL($raw_input){
		var $host;
    	//Make sure this url is an url
    	$this->clean = filter_var($raw_input, FILTER_VALIDATE_URL, FILTER_FLAG_SCHEME_REQUIRED, FILTER_FLAG_HOST_REQUIRED);
    	
    	if ($this->clean == true) 
    	{ 
    		//Get the hostname from the url
    		$this->host = parse_url($url, PHP_URL_HOST);
    		
    		//check if the domain really exists:
    		// If it exists, the URL is oke and can be returned.
    		if(checkdnsrr($this->host,"A")) { return $raw_input; } 
    		else { return false; }
        } 
        else { return false; } // This was not a valid url
	}

function cleanURL($raw_input){
		var $host;
    	//Make sure this url is an url
    	$this->clean = filter_var($raw_input, FILTER_VALIDATE_URL, FILTER_FLAG_SCHEME_REQUIRED, FILTER_FLAG_HOST_REQUIRED);
 
    	if ($this->clean == true) 
    	{ 
    		//Get the hostname from the url
    		$this->host = parse_url($url, PHP_URL_HOST);
 
    		//check if the domain really exists:
    		// If it exists, the URL is oke and can be returned.
    		if(checkdnsrr($this->host,"A")) { return $raw_input; } 
    		else { return false; }
        } 
        else { return false; } // This was not a valid url
	}

		if(@fopen(http://www.sitemasters.be,"r")) 
		{
// site bestaat
		}
 		else 
		{
// site bestaat niet
}

if(@fopen(http://www.sitemasters.be,"r")) 
		{
// site bestaat
		}
 		else 
		{
// site bestaat niet
}