php 图片添加文字水印 以及 图片合成(微信快码传播)

$bigImgPath = ‘backgroud.png‘;
    $img = imagecreatefromstring(file_get_contents($bigImgPath));

    $font = ‘msyhl.ttc‘;//字体
    $black = imagecolorallocate($img, 0, 0, 0);//字体颜色 RGB

    $fontSize = 20;   //字体大小
    $circleSize = 60; //旋转角度
    $left = 50;      //左边距
    $top = 150;       //顶边距

    imagefttext($img, $fontSize, $circleSize, $left, $top, $black, $font, ‘Rhythmk| 坤‘);

    list($bgWidth, $bgHight, $bgType) = getimagesize($bigImgPath);
    switch ($bgType) {
        case 1: //gif
            header(‘Content-Type:image/gif‘);
            imagegif($img);
            break;
        case 2: //jpg
            header(‘Content-Type:image/jpg‘);
            imagejpeg($img);
            break;
        case 3: //jpg
            header(‘Content-Type:image/png‘);
            imagepng($img);
            break;
        default:
            break;
    }
    imagedestroy($img);

        $bigImgPath = ‘backgroud.png‘;
        $qCodePath = ‘qcode.png‘;

        $bigImg = imagecreatefromstring(file_get_contents($bigImgPath));
        $qCodeImg = imagecreatefromstring(file_get_contents($qCodePath));

        list($qCodeWidth, $qCodeHight, $qCodeType) = getimagesize($qCodePath);
        // imagecopymerge使用注解
        imagecopymerge($bigImg, $qCodeImg, 200, 300, 0, 0, $qCodeWidth, $qCodeHight, 100);

        list($bigWidth, $bigHight, $bigType) = getimagesize($bigImgPath);


        switch ($bigType) {
            case 1: //gif
                header(‘Content-Type:image/gif‘);
                imagegif($bigImg);
                break;
            case 2: //jpg
                header(‘Content-Type:image/jpg‘);
                imagejpeg($bigImg);
                break;
            case 3: //jpg
                header(‘Content-Type:image/png‘);
                imagepng($bigImg);
                break;
            default:
                # code...
                break;
        }

        imagedestroy($bigImg);
        imagedestroy($qcodeImg);