1、題示的寫法，在創(chuàng)建了第一個子進程后，因為pcntl_wait系統(tǒng)調(diào)用會阻塞主進程。
2、進程部分參考代碼：

<?php
for ($i = 0; $i < 5; $i++) 
{
    $pid = pcntl_fork();
    echo $pid . PHP_EOL;
    if($pid < 0) {
        die('could not fork');
    }elseif($pid > 0) {
    }else{
        while(1){sleep(1);}
        exit;
    }
}

while(1)
{
    pcntl_wait($status);
}

感謝大神解答，但有疑惑，pcntl_wait($status); 我的寫法是寫在主進程執(zhí)行的代碼，也會阻塞子進程嗎，

$socket = socket_create(AF_INET,SOCK_STREAM,SOL_TCP);
socket_set_option($socket, SOL_SOCKET, SO_REUSEADDR, 1);
socket_set_nonblock($socket);
socket_bind($socket,'0.0.0.0',8666) or die('error');
socket_listen($socket,10);
$sockets = $socket;
while(true) {
for ($i = 0; $i < 5; $i++) {
$pid = pcntl_fork();
echo $pid;
if ($pid == -1) {
die('could not fork');
} else if ($pid) {

    } else {
        $clients = $sockets;
        socket_select($clients, $write, $except, NULL);
        foreach ($clients as $n=>$v) {
            if ($v == $socket) {
                $client = socket_accept($socket);
                $clients = $client;
            }else{
                $buf = socket_read($v, 1024);

                if (preg_match('/sleep/i', $buf)) {
                    $html = 'HTTP/1.1 200 OK' . PHP_EOL
                        . 'Content-Type: text/html;charset=utf-8' . PHP_EOL . PHP_EOL;
                    socket_write($v, $html);
                    socket_write($v, "this is server,45434");
                } else {
                    socket_write($v, "this is server");
                }
                unset($clients);
                socket_close($v);
                exit;//關(guān)閉子進程

            }
        }
    }
}
while(1){
    pcntl_wait($status); //等待上一個進程結(jié)束
}

}

socket_close($socket);
?這樣改寫之后，創(chuàng)建了不只5個進程 ，是5個子進程，但每個子進程又有子進程