一个socket_accept 初级问题

while(1){
    $this->socket = socket_accept($this->listend);
    $this->log((int)$socket);
    if((int)$socket<0){
        $this->log('accept error');
        return -1;
    }
    if(socket_getpeername($socket,$addr,$port)){
        $this->log("client:$addr - $port");
    }

    $this->buf = date('Y-m-d',time());

    sleep(5);
}
return 0;