dz安装ucenter后，验证码不显示解决办法

这个应该是服务器的环境问题，解决办法是：

找到/uc_server/control/admin/seccode.php

        include_once UC_ROOT.'lib/seccode.class.php';
        $code = new seccode();
        $code->code = $seccode;
        $code->type = 0;
        $code->width = 70;
        $code->height = 21;
        $code->background = 0;
        $code->adulterate = 1;
        //$code->ttf = 1;此处改成0
        $code->ttf = 0;
        $code->angle = 0;
        $code->color = 1;
        $code->size = 0;
        $code->shadow = 1;
        $code->animator = 0;
        $code->fontpath = UC_ROOT.'images/fonts/';
        $code->datapath = UC_ROOT.'images/';
        $code->includepath = '';
        $code->display();