<?php 
$job = new job();
$job->startJob();

class job
{
        public function startJob()
        {
                echo 'strated doing job';
                $this->job();
                echo 'finished doing job';
        }

        private function job()
        {
                $i = 0;
                while(++$i < 100)
                {

                }
        }
} 1