<?php
/**
 * Created by PhpStorm.
 * User: mac
 * Date: 2020/4/23
 * Time: 21:57
 */

echo posix_getpid();
while(true)
{
	sleep(1);
}

mac@macdeMacBook-Pro:/www/learn_lumen/wang$     php index.php 
47976

mac@macdeMacBook-Pro:/www/learn_lumen/wang$     ps -ef|grep index.php
  501 47976 89607   0 10:01下午 ttys000    0:00.07 php index.php
  501 47986 90454   0 10:02下午 ttys002    0:00.00 grep index.php
mac@macdeMacBook-Pro:/www/learn_lumen/wang$ 

<?php
/**
 * Created by PhpStorm.
 * User: mac
 * Date: 2020/4/23
 * Time: 21:57
 */

echo posix_getpid().PHP_EOL;
echo posix_getppid();
while(true)
{
	sleep(1);
}

mac@macdeMacBook-Pro:/www/learn_lumen/wang$     php index.php 
48015
89607

mac@macdeMacBook-Pro:/www/learn_lumen/wang$     ps -ef|grep index.php
  501 48015 89607   0 10:03下午 ttys000    0:00.08 php index.php
  501 48018 90454   0 10:03下午 ttys002    0:00.00 grep index.php
mac@macdeMacBook-Pro:/www/learn_lumen/wang$