PHP libevent实现聊天室

<?php
//守护进程化
daemonize();

$socket = stream_socket_server ('tcp://127.0.0.1:9998', $errno, $errstr);
stream_set_blocking($socket, 0);
$base = event_base_new();
$event = event_new();
event_set($event, $socket, EV_READ | EV_PERSIST, 'ev_accept', $base);
event_base_set($event, $base);
event_add($event);
event_base_loop($base);

$GLOBALS['connections'] = array();
$GLOBALS['buffers'] = array();

function ev_accept($socket, $flag, $base) {
    static $id = 0;

    $connection = stream_socket_accept($socket);
    stream_set_blocking($connection, 0);

    $id += 1;

    $buffer = event_buffer_new($connection, 'ev_read', NULL, 'ev_error', $id);
    event_buffer_base_set($buffer, $base);
    event_buffer_timeout_set($buffer, 30, 30);
    event_buffer_watermark_set($buffer, EV_READ, 0, 0xffffff);
    event_buffer_priority_set($buffer, 10);
    event_buffer_enable($buffer, EV_READ | EV_PERSIST);

    // we need to save both buffer and connection outside
    $GLOBALS['connections'][$id] = $connection;
    $GLOBALS['buffers'][$id] = $buffer;
}

function ev_error($buffer, $error, $id) {
    event_buffer_disable($GLOBALS['buffers'][$id], EV_READ | EV_WRITE);
    event_buffer_free($GLOBALS['buffers'][$id]);
    fclose($GLOBALS['connections'][$id]);
    unset($GLOBALS['buffers'][$id], $GLOBALS['connections'][$id]);
}

function ev_read($buffer, $id) {
    while ($read = event_buffer_read($buffer, 256)) {
        foreach( $GLOBALS['connections'] as $ids => $conn ) {
                if( $ids != $id ) {
                        fwrite($conn,$read);
                }
        }
    }
}


function daemonize()
{
        $pid = pcntl_fork();
        if ($pid == -1)
        {
                die("fork(1) failed!\n");
        }
        elseif ($pid > 0)
        {
                //让由用户启动的进程退出
                exit(0);
        }

        //建立一个有别于终端的新session以脱离终端
        posix_setsid();

        $pid = pcntl_fork();
        if ($pid == -1)
        {
                die("fork(2) failed!\n");
        }
        elseif ($pid > 0)
        {
                //父进程退出, 剩下子进程成为最终的独立进程
                exit(0);
        }
}

?>