php背景水印图片生成代码

php背景水印图片生成代码

 /**
     *@author:yangtao
     *@date:2016-08-12
     *@content: 背景水印
     */
    public function getbgwatermark(){

        $imgWidth = 150;
        $imgHeight = 150;
        $img = imagecreatetruecolor($imgWidth, $imgHeight);
        $bgcolor = imagecolorallocate($img,255,255,255);
        imagefill($img, 0, 0, $bgcolor);

        $text = imagecreatetruecolor($imgWidth, $imgHeight);
        imagefill($text, 0, 0, $bgcolor);
        $font_size = 10;
        $font_name = VENDOR_PATH."topthink/think-captcha/assets/ttfs/1.ttf";
        $ucode = $this->getUserinfo('userCode');
        if($ucode=="") $ucode = "测试文字";
        $font_color = imagecolorallocate($img, mt_rand(100,200), mt_rand(100,200), mt_rand(100,200));
        imagettftext($text, $font_size, 50, 10,90, $font_color, $font_name, $ucode);

        imagecopymerge($img,$text,0,0,0,0,$imgWidth,$imgHeight,20);

        header('content-type:image/png');
        imagepng($img);
        imagedestroy($img);
    }