php合成图片 文字

代码：

public function mergePic(){
        $ground = '/Public/merge/beijing.png';
        $img = [
            'url'=>'/Public/merge/qrcode.png',
            'x'=>100,
            'y'=>100
        ];
        $qr = [
            'url'=>'/Public/merge/qr.jpg',
            'x'=>150,
            'y'=>1400
        ];
        $text = [
            'size'=>20,
            'text'=>'123456'
        ];
        $this->merge($ground,$img,$qr,$text);
    }

    /**
     * @param $ground string 背景
     * @param $img array 图片
     * @param $qr array 二维码
     * @param $text array 文字
     */
    public function merge($ground,$img=[],$qr=[],$text=[]){
        $types = [
            "image/jpg" => 'imagecreatefromjpeg',
            "image/jpeg" => 'imagecreatefromjpeg',
            "image/png" => 'imagecreatefrompng',
            "image/pjpeg"  => 'imagecreatefromjpeg',
            "image/gif"  => 'imagecreatefromgif',
            "image/bmp"  => 'imagecreatefromwbmp',
            "image/x-png"  => 'imagecreatefromjpeg'
        ];
        $groundMime = getimagesize(getcwd().$ground);
        $grounds = $types[$groundMime['mime']](getcwd().$ground);//获取图片资源
//        $fileName = "/Public/merge/".time().".png";//保存图片目录
        $fileName = "/Public/merge/123.png";//保存图片目录
        if($img){
            $imgMime = getimagesize(getcwd().$img['url']);
            $imgs = $types[$imgMime['mime']](getcwd().$img['url']);//获取图片资源
            $imgsW = imagesx($imgs);//图片宽
            $imgsH = imagesy($imgs);//图片高
            imagecopy($grounds, $imgs, $img['x'], $img['y'], 0, 0, $imgsW, $imgsH);//核心函数：复制图片资源到另一图片资源中
        }

        if($qr){
            $qrMime = getimagesize(getcwd().$qr['url']);
            $qrs = $types[$qrMime['mime']](getcwd().$qr['url']);//获取图片资源
            $qrsW = imagesx($qrs);//图片宽
            $qrsH = imagesy($qrs);//图片高
            imagecopy($grounds, $qrs, $qr['x'], $qr['y'], 0, 0, $qrsW, $qrsH);//核心函数：复制图片资源到另一图片资源中
        }

        if($text){
            $size = $text['size'];//字体大小
            $font = "./Public/merge/yuanti.ttf";//字体
            $text = $text['text'];//显示的文字
            $grey = imagecolorallocate($grounds,0,0,0);//设置字体颜色
            imagettftext($grounds,$size,0,100,100,$grey,$font,$text);//将ttf文字写到图片中
        }

        imagepng($grounds,getcwd().$fileName); //保存
        imagedestroy($grounds);
        imagedestroy($imgs);
        imagedestroy($qrs);//销毁图片资源
    }

参考：

PHP 使用GD库合成带二维码的海报步骤以及源码实现

将图片绘制到画布上：imagecopy()