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))
   {
    $mand = exec("/bin/ps -p $last_pid -o mand=");

    if ($mand == $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();
  $mand = exec("/bin/ps -p $pid -o mand=");

  return $mand;
 }

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