强制PHP命令行脚本单进程运行的方法

 /**
  * 保证单进程
  *
  * @param string $processname 进程名
  * @param string $pidfile 进程文件路径
  * @return boolean 是否继续执行当前进程
  */
 function singleprocess($processname, $pidfile)
 {
  if (file_exists($pidfile) && $fp = @fopen($pidfile,"rb"))
  {
   flock($fp, lock_sh);
   $last_pid = fread($fp, filesize($pidfile));
   fclose($fp);

   if (!empty($last_pid))
   {
    $command = exec("/bin/ps -p $last_pid -o command=");

    if ($command == $processname)
    {
     return false;
    }
   }
  }

  $cur_pid = posix_getpid();

  if ($fp = @fopen($pidfile, "wb"))
  {
   fputs($fp, $cur_pid);
   ftruncate($fp, strlen($cur_pid));
   fclose($fp);

   return true;
  }
  else
  {
   return false;
  }
 }

 /**
  * 获取当前进程对应的command
  *
  * @return string 命令及其参数
  */
 function getcurrentcommand()
 {
  $pid     = posix_getpid();
  $command = exec("/bin/ps -p $pid -o command=");

  return $command;
 }

使用方法：

if (singleprocess(getcurrentcommand(), 'path/to/script.pid'))
{
    // code goes here
}
else
{
 exit("sorry, this script file has already been running ...\n");
}