<?php 

$i=0;
while($i!=5){
   $pid = pcntl_fork();
   if ($pid == 0) {
      echo $pid."---------hahah".getmypid().PHP_EOL;
      return;
   } else if($pid > 0) {
      pcntl_wait($status);
   } else {
      echo "can not fork";
   }
   $i++;
}