PHP多进程处理tcp连接

<?php
if(($sock = socket_create(AF_INET, SOCK_STREAM, 0)) < 0)
{
        echo "failed to create socket: ".socket_strerror($sock)."\n";
        exit();
}

if(($ret = socket_bind($sock,'127.0.0.1', 8888)) < 0)
{
        echo "failed to bind socket: ".socket_strerror($ret)."\n";
        exit();
}

if( ( $ret = socket_listen( $sock, 0 ) ) < 0 ) 
{
        echo "failed to listen to socket: ".socket_strerror($ret)."\n";
        exit();
}

while (true)
{
        $conn = @socket_accept($sock);

        //子进程
        if(pcntl_fork() == 0)
        {   
                $recv = socket_read($conn, 8192);
                //处理数据
                $send_data = "server: ".$recv;
                socket_write($conn, $send_data);
                socket_close($conn);
                exit(0);
        }   
        else
        {   
                socket_close($conn);
        }   
}