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()