PHP pcntl Multi-process usages _php tips

This article is an example of PHP's PCNTL multi-process usage. Share to everyone for your reference. The specific analysis is as follows:

PHP uses the PCNTL series functions to do multiple processes to handle a transaction. For example, I need to get 80w data from the database, and then do a series of subsequent processing, this time, with a single process? You can wait until next year today. So you should use the PCNTL function.

Let's say I want to start 20 processes, divide the 1-80w data into 20 parts, and the main process waits for all the child processes to end before exiting:

$max = 800000;
$workers =;
$pids = Array ();
for ($i = 0; $i < $workers; $i + +) {
  $pids [$i] = Pcntl_fork ();
  Switch ($pids [$i]) {
    case-1:
      echo "fork error: {$i} \ r \ n";
      Exit;
    Case 0:
      $param = Array (
        ' LastID ' => $max/$workers * $i,
        ' Maxid ' => $max/$workers * ($i + 1),
      ) ;
      $this->executeworker ($input, $output, $param);
      Exit;
    Default: Break
      ;
  }
}
foreach ($pids as $i => $pid) {
  if ($pid) {
    pcntl_waitpid ($pid, $status);
  }
}

Here when pcntl_fork out, will return a PID value, this PID in the child process see is 0, in the parent process is a child process PID (>0), if the PID 1 indicates that fork error.

Using a $pids array allows the main process to wait for all processes to end.

I hope this article will help you with your PHP program design.