php模仿tail实现读取log文件

PHP

if (isset($_GET['ajax'])) {
            $this->autoRender = false;
            if (RunTime === \App\Library\Resources::Development) {
                $handle = fopen(LOGS . 'debug.log', 'r');
            } else {
                $handle = fopen('/tmp/111.log', 'r');
            }
            if (isset($_SESSION['offset'])) {
                $data = stream_get_contents($handle, -1, $_SESSION['offset']);
                $_SESSION['offset'] += strlen($data);
                echo nl2br($data);
            } else {
                fseek($handle, 0, SEEK_END);
                $_SESSION['offset'] = ftell($handle);
            }
            exit();
        }

HTML

<script src="http://creativecouple.github.com/jquery-timing/jquery-timing.min.js"></script>
<script>
    $(function () {
        $.repeat(1000, function () {
            $.get('/unit/showlog?ajax', function (data) {
                var tail = $('#tail');
                if (tail.height() > 768)
                    tail.text(data);
                else
                    tail.append(data);
            });
        });
    });
</script>
<div id="tail">Starting up...</div>