Help with an online checker

[Marcant]

Hi
Im having troubles with an online checker

$link = $linksdata['link'];

$cslink = strtok($link,"@");
$cnum = strlen($cslink)+1;
$ftpip = strtok(substr($link,$cnum),":");
$cnum2 = strlen($cslink)+strlen($ftpip)+2;
$ftpport = substr($linksdata['link'],$cnum2);
$ftpport2 = -(strlen($ftpport));
$ftpport = substr($ftpport,$ftpport2,-1);
$linkcheck = @fsockopen ("$ftpip",$ftpport,$errno,$errstr,10);

if (!$linkcheck)
{
 $status = "Down";
}

else
{
	         $status = "Online";
	@fclose ($linkcheck);
}

the problem in my code is that if I add the full path to where the scripts are located in my servers it will show them as down

only works when I don't add the full path I wnat to know if there is any way to extract the port even if I add full path like this

[url]ftp://blabla:blabla@123.456.789:21/mynewscripts/scriptname.mrc[/url]

thanks in advance