Swoole\Image::verifycode_chinese PHP Method

    static function verifycode_chinese($font, $width = 180, $height = 60)
    {
        $length = 4;
        $angle = 45;
        $width = $length * 45 > $width ? $length * 45 : $width;
        $im = imagecreatetruecolor($width, $height);
        $borderColor = imagecolorallocate($im, 100, 100, 100);
        //边框色
        $bkcolor = imagecolorallocate($im, 250, 250, 250);
        imagefill($im, 0, 0, $bkcolor);
        imagerectangle($im, 0, 0, $width - 1, $height - 1, $borderColor);
        // 干扰
        for ($i = 0; $i < 5; $i++) {
            $fontcolor = imagecolorallocate($im, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));
            imagearc($im, mt_rand(-10, $width), mt_rand(-10, $height), mt_rand(30, 300), mt_rand(20, 200), 55, 44, $fontcolor);
        }
        for ($i = 0; $i < 255; $i++) {
            $fontcolor = imagecolorallocate($im, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));
            imagesetpixel($im, mt_rand(0, $width), mt_rand(0, $height), $fontcolor);
        }
        $code = '';
        for ($i = 0; $i < $length; $i++) {
            $fontcolor = imagecolorallocate($im, mt_rand(0, 120), mt_rand(0, 120), mt_rand(0, 120));
            //这样保证随机出来的颜色较深。
            $codex = RandomKey::getChineseCharacter(1);
            $code .= $codex;
            @imagettftext($im, mt_rand(16, 20), mt_rand(-$angle, $angle), 40 * $i + 20, mt_rand(30, 35), $fontcolor, $font, $codex);
        }
        ob_start();
        ImagePng($im);
        $data = ob_get_clean();
        ImageDestroy($im);
        return array('code' => $code, 'image' => $data);
    }

 function vcode()
 {
     $this->session->start();
     $this->http->header('Content-Type', 'image/jpeg');
     $verifyCode = Swoole\Image::verifycode_chinese('/usr/share/fonts/truetype/wqy/wqy-microhei.ttc');
     //        debug($verifyCode);
     //        $verifyCode = Swoole\Image::verifycode_gd();
     //        $verifyCode = Swoole\Image::verifycode_imagick();
     $_SESSION['vcode'] = $verifyCode['code'];
     return $verifyCode['image'];
 }