php 合成图片，合成圆形图片

合成图片方法

<?php
class Share {
 

    /*
     * 生成分享图片
     * */
    function cre_share_study_img(){
        $auth = json_decode(base64_decode($_GET['auth']),true);
        $url = trim(strip_tags($auth['url']));
        $uid = max(0,strip_tags($auth['id'])); //120618218;
        if(empty($url) || !$uid){
            exit();
        }
        $userInfo = get_user_info($uid);
        if(empty($userInfo) ){
            exit();
        }
        $avatar = $userInfo['avatar'];
        $nickname = $userInfo['nickname'];

        $bg_img = ROOT_PATH.'/static/study/study_bg.png';
        $imgArr=getimagesize($bg_img);
        $bg_width = $imgArr[0];
        $required_memory = $imgArr[0] * $imgArr[1] * $imgArr['bits'];
        $new_limit=memory_get_usage() + $required_memory + 20000000;
        ini_set("memory_limit", $new_limit);
        $image = imagecreatefrompng($bg_img);

        $black = imagecolorallocate($image, 61, 61, 61); // 黑色
        $font = ROOT_PATH.'/static/redpacket/msyh.ttc';

        $text = "{$nickname} 的书屋";
        $text_len = (strlen($text) + mb_strlen($text,'utf-8')) / 2;
        $text_begin = ($bg_width-($text_len*16))/2;
        imagettftext($image, 26, 0, $text_begin, 380, $black, $font,$text);

        // 头像
        $is_icon = $this->put_file_from_url_content($avatar,ROOT_PATH.'/static/study/user_temp.png');
        if($is_icon){ // 保存网络图片成功执行合并头像
            $icon_img = $this->radius_img($is_icon);
            header('Content-type: image/png;');
            $is_icon_png = ROOT_PATH.'/static/study/user.png';
            imagepng($icon_img,$is_icon_png);
            imagedestroy($icon_img);
            $imgsarr = getimagesize($is_icon_png);
            $icon_width = $imgsarr[0];
            if (strstr($imgsarr['mime'], 'jpeg')){
                $icon_img = imagecreatefromjpeg($is_icon_png);
            }else{
                $icon_img = imagecreatefrompng($is_icon_png);
            }
            unlink($is_icon);
            unlink($is_icon_png);
            $avatarWidth = 155;
            imagecopyresampled($image, $icon_img, ($bg_width-$avatarWidth)/2, 165, 0, 0, $avatarWidth, $avatarWidth, $icon_width, $icon_width);//合成头像到
        }

        //合成二维码到
        $qrcode = $this->cre_qrcode($url);
        $imgsarr = getimagesize($qrcode);
        $icon_width = $imgsarr[0];
        $qrcode = imagecreatefrompng($qrcode);
        $code_img_w = 360;
        imagecopyresampled($image, $qrcode, ($bg_width-$code_img_w)/2, 595, 0, 0, $code_img_w, $code_img_w,$icon_width, $icon_width);

        header('Content-type: image/png;');
        imagepng($image);
        imagedestroy($image);
        ini_restore ("memory_limit");
    }
    // 生成二维码
    function cre_qrcode($url='',$tmp_qr = ROOT_PATH.'/static/study/qr_code.png'){
        vendor('Phcode.phpqrcode');
        $errorCorrectionLevel = 3;//容错级别
        $matrixPointSize = 10;//生成图片大小
        //生成二维码图片
        QRcode::png($url, $tmp_qr, $errorCorrectionLevel, $matrixPointSize, 2);
        return $tmp_qr;
    }

    // 把图片转换成 圆形
    private function radius_img($imgpath = './public/qrcode/qrcode.jpg', $radius = 0){
        $ext = pathinfo($imgpath);
        $src_img = null;
        switch ($ext['extension']){
            case 'jpg':
                $src_img = imagecreatefromjpeg($imgpath);
                break;
            case 'png':
                $src_img = imagecreatefrompng($imgpath);
                break;
            case 'gif':
                $src_img = imagecreatefromgif($imgpath);
                break;
        }
        $wh = getimagesize($imgpath);
        $w = $wh[0];
        $h = $wh[1];
        $radius = $radius == 0 ? (min($w, $h) / 2) : $radius;
        $img = imagecreatetruecolor($w, $h);
        //这一句一定要有
        imagesavealpha($img, true);
        //拾取一个完全透明的颜色,最后一个参数127为全透明
        $bg = imagecolorallocatealpha($img, 255, 255, 255, 127);
        imagefill($img, 0, 0, $bg);
        $r = $radius; //圆 角半径
        for ($x = 0; $x < $w; $x++){
            for ($y = 0; $y < $h; $y++){
                $rgbColor = imagecolorat($src_img, $x, $y);
                if (($x >= $radius && $x <= ($w - $radius)) || ($y >= $radius && $y <= ($h - $radius))){
                    //不在四角的范围内,直接画
                    imagesetpixel($img, $x, $y, $rgbColor);
                }else{
                    //在四角的范围内选择画
                    //上左
                    $y_x = $r; //圆心X坐标
                    $y_y = $r; //圆心Y坐标
                    if (((($x - $y_x) * ($x - $y_x) + ($y - $y_y) * ($y - $y_y)) <= ($r * $r))){
                        imagesetpixel($img, $x, $y, $rgbColor);
                    }
                    //上右
                    $y_x = $w - $r; //圆心X坐标
                    $y_y = $r; //圆心Y坐标
                    if (((($x - $y_x) * ($x - $y_x) + ($y - $y_y) * ($y - $y_y)) <= ($r * $r))){
                        imagesetpixel($img, $x, $y, $rgbColor);
                    }
                    //下左
                    $y_x = $r; //圆心X坐标
                    $y_y = $h - $r; //圆心Y坐标
                    if (((($x - $y_x) * ($x - $y_x) + ($y - $y_y) * ($y - $y_y)) <= ($r * $r))){
                        imagesetpixel($img, $x, $y, $rgbColor);
                    }
                    //下右
                    $y_x = $w - $r; //圆心X坐标
                    $y_y = $h - $r; //圆心Y坐标
                    if (((($x - $y_x) * ($x - $y_x) + ($y - $y_y) * ($y - $y_y)) <= ($r * $r))){
                        imagesetpixel($img, $x, $y, $rgbColor);
                    }
                }
            }
        }
        return $img;
    }

    /**
     * 异步将远程链接上的内容(图片或内容)写到本地
     * @param unknown $url 远程地址
     * @param unknown $saveName保存在服务器上的文件名
     * @param unknown $path保存路径
     * @return boolean
     */
    function put_file_from_url_content($url='',$path='/static/study/user_temp') {
        //方法一：//推荐用该方法
        $header = array(
            'User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0',
            'Accept-Language: zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3',
            'Accept-Encoding: gzip, deflate',);
//        $url='http://wx.qlogo.cn/mmopen/vi_32/Q0j4TwGTfTKkGpNuUhaBniatRsiaG7ksqmhUWzkk40kTRS6icQS7kJcsfxcibQo7vDFcKibr7NHb9YIXiaXsEtLcdL6A/0';
        $curl = curl_init();curl_setopt($curl, CURLOPT_URL, $url);
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true);
        curl_setopt($curl, CURLOPT_ENCODING, 'gzip');
        curl_setopt($curl, CURLOPT_HTTPHEADER, $header);
        $data = curl_exec($curl);
        $code = curl_getinfo($curl, CURLINFO_HTTP_CODE);
        curl_close($curl);
        if ($code == 200) {//把URL格式的图片转成base64_encode格式的！
            $imgType = 'image/jpeg';
            if(function_exists('get_headers')){
                $imghttp = get_headers($url,true);
                $imgType = $imghttp['Content-Type'];
            };
            $imgBase64Code = "data:{$imgType};base64," . base64_encode($data);
            $img_content = $imgBase64Code;//图片内容
            if (preg_match('/^(data:\s*image\/(\w+);base64,)/', $img_content, $result)) {
                $type = $result[2];//得到图片类型png?jpg?gif?
                if($type == 'jpeg'){
                    $type = 'jpg';
                }
                $path = "{$path}.{$type}";
                if (file_put_contents($path, base64_decode(str_replace($result[1], '', $img_content)))) {
                    return $path;
                }
            }
        }
        return false;
    }
}

　　

注意 背景图片，字体，二维码图片，头像图片都必须先存在