1<?php
2$process = new swoole_process(function (swoole_process $worker)
3{
4    echo "Worker: start. PID=" . $worker->pid . "\n";
5    sleep(2);
6    $worker->close(swoole_process::PIPE_READ);
7    $worker->write("hello master\n");
8    $worker->exit(0);
9}, false);
10
11$pid = $process->start();
12$r = array($process);
13$w = array();
14$e = array();
15$ret = swoole_select($r, $w, $e, 1.0);
16var_dump($ret);
17var_dump($process->read());
18