<?php    function newChild($func_name) {      echo "enter newChild/n";      $args = func_get_args();      unset($args[0]);      $pid =  pcntl_fork();      if ($pid == 0) {          function_exists($func_name) and exit(call_user_func_array($func_name, $args)) or exit(-1);      } else if($pid == -1) {          echo "Couldn't create child process";      } else {          return $pid;      }  }    （PS：^_^不错的php开发交流群：256271784，验证：csl，有兴趣的话可以加入进来一起讨论）function on_timer() {      echo "timer called/n";  }      /**  * @param $func string, function name  * @param $timeouts int, microtimes for time delay  */  function timer($func, $timeouts){          echo "enter timer/n";      $base = event_base_new();      $event = event_new();          event_set($event, 0, EV_TIMEOUT, $func);      event_base_set($event, $base);      event_add($event, $timeouts);          event_base_loop($base);  }      $pid = newChild("timer", "on_timer", 5000000);      if ($pid > 0) {      echo "master process exit/n";  }