How to use pcntl function to operate multiple processes in PHP

This article mainly introduces the usage of PHP's pcntl multi-process. The example analyzes the usage skills of pcntl operating multi-process. It is of great practical value. Friends in need can refer to it.

The example of this article describes the use of PHP pcntl multi-process usage. The specific analysis is as follows:

PHP can also handle a transaction with multiple processes using the PCNTL series of functions. For example, I need to obtain 800,000 pieces of data from the database and then perform a series of subsequent processing. At this time, should I use a single process? You can wait until today next year. So you should use the pcntl function.

Suppose I want to start 20 processes and divide the 1-80w data into 20 parts. The main process waits for all child processes to finish before exiting:

$max = 800000;
$workers = 20;
$pids = array();
for($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(
        &#39;lastid&#39; => $max / $workers * $i,
        &#39;maxid&#39; => $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 comes out In the future, a pid value will be returned. This pid is 0 in the child process, and is the pid of the child process (>0) in the parent process. If the pid is -1, it means that the fork went wrong.

Using a $pids array allows the main process to wait for all processes to complete before ending it

Summary: The above is the entire content of this article, I hope it can help Everyone’s learning helps.

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