復制代碼 代碼如下:

 /**
  * 保證單進程
  *
  * @param string $processName 進程名
  * @param string $pidFile 進程文件路徑
  * @return boolean 是否繼續執行當前進程
  */
 function singleProcess($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;
  }
 }

 /**
  * 獲取當前進程對應的Command
  *
  * @return string 命令及其參數
  */
 function getCurrentCommand()
 {
  $pid     = posix_getpid();
  $command = exec("/bin/ps -p $pid -o command=");

  return $command;
 }

使用方法：

復制代碼 代碼如下:

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