(PECL gearman >= 0.5.0)
GearmanWorker::addServer — Add a job server
public GearmanWorker::addServer ([ string $host = 127.0.0.1 [, int $port = 4730 ]] ) : bool
Adds a job server to this worker. This goes into a list of servers than can be used to run jobs. No socket I/O happens here.
host
The job server host name.
port
The job server port.
 Returns true on success or false on failure. 
Example #1 Add alternate Gearman servers
<?php
$worker= new GearmanWorker(); 
$worker->addServer("10.0.0.1"); 
$worker->addServer("10.0.0.2", 7003);
?> 
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    https://www.php.net/manual/en/gearmanworker.addserver.php