[URGENT] Neep help in adding "killall - 9 httpd" to my cron

Hey guys I've this php running in cron, to check httpd down status and start it again. The problem is sometimes It wouldn't start unless i use the killall manually..

<?php
 class monitor {
 
 function httpUp() {
  $status = shell_exec("/etc/init.d/httpd status");
  
  if (preg_match("#is running#",$status)) {
   return true;
  } else {
   return false;
                       }
  
 }
 
 function restartHttp() {
  shell_exec("/etc/init.d/httpd start");
 }
 
 function writeLog($message) {
  $s = sprintf("[%s] %s\n",date("d-m-y g:i a"),$message);
                       file_put_contents("httpd.log",$s,FILE_APPEND);
 }
 
}
 chdir("/root/");
 $monitor = new monitor();
 if ($monitor->httpUp()) {
 $monitor->writeLog("httpd already running");
} else {
 $monitor->writeLog("httpd is down");
 $monitor->restartHttp();
 $monitor->writeLog("httpd has been started");
                     }
 ?>

Code (markup):

The log file goes like this
[16-11-09 3:00 pm] httpd already running
[16-11-09 3:11 pm] httpd already running
[16-11-09 3:20 pm] httpd is down
[16-11-09 3:20 pm] httpd has been started

Can someone edit the script for me and add "killall - 9 httpd" right before it start the httpd? And so the log will look like this:

httpd is down
Processes have been killed
httpd has been started