code: public function setChildProcessTitleFormat($string) {
  		if ($this->created) {
  			throw new WorkerPoolException('Cannot set the Parent\'s Process Title Format for a created pool.');
  		}
  		$this->childProcessTitleFormat = ProcessDetails::sanitizeProcessTitleFormat($string);
  		return $this;
  	}
docs: Sets the process title of the child
  
  Listing permitted replacments
  %i%         The Child's Number
  %basename%  The base name of PHPSELF
  %fullname%  The value of PHPSELF
  %class%     The Worker's Classname
  %state%     The Worker's State
  
  @param string $string the process title of the child
  @return WorkerPool
  @throws \QXS\WorkerPool\WorkerPoolException in case the WorkerPool has already been created
  @throws \DomainException in case the $string value is not within the permitted range