code: public function remove(ProcessDetails $processDetails) {
  		$pid = $processDetails->getPid();
  
  		if ($this->hasProcess($pid) === FALSE) {
  			throw new \InvalidArgumentException(sprintf('Could not remove process. Process (%d) not in list.', $processDetails->getPid()), 1400761297);
  		}
  
  		if (isset($this->freeProcessIds[$pid])) {
  			unset($this->freeProcessIds[$pid]);
  		}
  
  		if (isset($this->sockets[$pid])) {
  			unset($this->sockets[$pid]);
  		}
  
  		unset($this->processDetails[$pid]);
  
  		return $this;
  	}
docs: Removes the ProcessDetails from the list.
  
  @param ProcessDetails $processDetails
  @throws \InvalidArgumentException
  @return ProcessDetailsCollection