PHP多进程控制demo

自己谢了个多进程控制的框架代码，留着备查

declare(ticks=1);function sigHandler($signal){    echo "a child exited\n";}pcntl_signal(SIGCHLD, sigHandler, false);echo "this is " . posix_getpid() . PHP_EOL;for($i=0; $i<3; $i++){    $pid = pcntl_fork();    if($pid == -1)     {           echo 'fork failed ' . PHP_EOL;    }       else if($pid)    {       }       else    {           $pid = posix_getpid();        echo 'child ' . $pid . ' ' . time() . PHP_EOL;        sleep(rand(2,5));        echo 'child ' . $pid . ' done ' . time() . PHP_EOL;        exit(0);    }   }do{    $pid = pcntl_wait($status);     echo 'child quit ' . $pid . PHP_EOL;}while($pid > 0); echo 'parent done' . PHP_EOL;