Get IP of multiple players

Ok, so I am making an alt finder plugin, and I have this piece of code:

PHP:

$players = $sender->getServer()->getOnlinePlayers();
$otherip = $players->getAddress();

I got this error in the console:

Code:

 [Server thread/CRITICAL]: Error: "Call to a member function getAddress() on array" (EXCEPTION) in "plugins/AltFinder/src/ethaniccc/AltFinder/Main" at line 55

Is there any way I can get the IP of multiple players at once?
Thanks in advance!
~ Ethaniccc

 

Learn php. you are trying to get the ip of an array of players. Do it one by one with a foreach

 

I just realized when I was looking at other plugins. Thank you!