PHP generates shared image examples

Recent work requirements require the generation of shared images. Initially, there were various problems with the html2canvas screenshot plug-in of js. Later, the PG library of PHP was used to generate images in the background. Various problems were happily solved. The effect we want to achieve is as follows:

Assume that the resource folder used in the code is in the current code_png directory:

/**
 * 分享图片生成
 * @param $gData  商品数据，array
 * @param $codeName 二维码图片
 * @param $fileName string 保存文件名,默认空则直接输入图片
 */
function createSharePng($gData,$codeName,$fileName = ''){
    //创建画布
    $im = imagecreatetruecolor(618, 1000);

    //填充画布背景色
    $color = imagecolorallocate($im, 255, 255, 255);
    imagefill($im, 0, 0, $color);

    //字体文件
    $font_file = "code_png/msyh.ttf";
    $font_file_bold = "code_png/msyh_bold.ttf";

    //设定字体的颜色
    $font_color_1 = ImageColorAllocate ($im, 140, 140, 140);
    $font_color_2 = ImageColorAllocate ($im, 28, 28, 28);
    $font_color_3 = ImageColorAllocate ($im, 129, 129, 129);
    $font_color_red = ImageColorAllocate ($im, 217, 45, 32);

    $fang_bg_color = ImageColorAllocate ($im, 254, 216, 217);

    //Logo
    list($l_w,$l_h) = getimagesize('code_png/logo100_100.png');
    $logoImg = @imagecreatefrompng('code_png/logo100_100.png');
    imagecopyresized($im, $logoImg, 274, 28, 0, 0, 70, 70, $l_w, $l_h);

    //温馨提示
    imagettftext($im, 14,0, 100, 130, $font_color_1 ,$font_file, '温馨提示：喜欢长按图片识别二维码即可前往购买');

    //商品图片
    list($g_w,$g_h) = getimagesize($gData['pic']);
    $goodImg = createImageFromFile($gData['pic']);
    imagecopyresized($im, $goodImg, 0, 185, 0, 0, 618, 618, $g_w, $g_h);

    //二维码
    list($code_w,$code_h) = getimagesize($codeName);
    $codeImg = createImageFromFile($codeName);
    imagecopyresized($im, $codeImg, 440, 820, 0, 0, 170, 170, $code_w, $code_h);

    //商品描述
    $theTitle = cn_row_substr($gData['title'],2,19);
    imagettftext($im, 14,0, 8, 845, $font_color_2 ,$font_file, $theTitle[1]);
    imagettftext($im, 14,0, 8, 875, $font_color_2 ,$font_file, $theTitle[2]);

    imagettftext($im, 14,0, 8, 935, $font_color_2 ,$font_file, "券后价￥");
    imagettftext($im, 28,0, 80, 935, $font_color_red ,$font_file_bold, $gData["price"]);
    imagettftext($im, 14,0, 8,970, $font_color_3 ,$font_file, "现价￥".$gData["original_price"]);

    //优惠券
    if($gData['coupon_price']){
        imagerectangle ($im, 125 , 950 , 160 , 975 , $font_color_3);
        imagefilledrectangle ($im, 126 , 951 , 159 , 974 , $fang_bg_color);
        imagettftext($im, 14,0, 135,970, $font_color_3 ,$font_file, "券");

        $coupon_price = strval($gData['coupon_price']);
        imagerectangle ($im, 160 , 950 , 198 + (strlen($coupon_price)* 10), 975 , $font_color_3);
        imagettftext($im, 14,0, 170,970, $font_color_3 ,$font_file, $coupon_price."元");
    }

    //输出图片
    if($fileName){
        imagepng ($im,$fileName);
    }else{
        Header("Content-Type: image/png");
        imagepng ($im);
    }

    //释放空间
    imagedestroy($im);
    imagedestroy($goodImg);
    imagedestroy($codeImg);
}

/**
 * 从图片文件创建Image资源
 * @param $file 图片文件，支持url
 * @return bool|resource    成功返回图片image资源，失败返回false
 */
function createImageFromFile($file){
    if(preg_match('/http(s)?:\/\//',$file)){
        $fileSuffix = getNetworkImgType($file);
    }else{
        $fileSuffix = pathinfo($file, PATHINFO_EXTENSION);
    }

    if(!$fileSuffix) return false;

    switch ($fileSuffix){
        case 'jpeg':
            $theImage = @imagecreatefromjpeg($file);
            break;
        case 'jpg':
            $theImage = @imagecreatefromjpeg($file);
            break;
        case 'png':
            $theImage = @imagecreatefrompng($file);
            break;
        case 'gif':
            $theImage = @imagecreatefromgif($file);
            break;
        default:
            $theImage = @imagecreatefromstring(file_get_contents($file));
            break;
    }

    return $theImage;
}

/**
 * 获取网络图片类型
 * @param $url  网络图片url,支持不带后缀名url
 * @return bool
 */
function getNetworkImgType($url){
    $ch = curl_init(); //初始化curl
    curl_setopt($ch, CURLOPT_URL, $url); //设置需要获取的URL
    curl_setopt($ch, CURLOPT_NOBODY, 1);
    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 3);//设置超时
    curl_setopt($ch, CURLOPT_TIMEOUT, 3);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); //支持https
    curl_exec($ch);//执行curl会话
    $http_code = curl_getinfo($ch);//获取curl连接资源句柄信息
    curl_close($ch);//关闭资源连接

    if ($http_code['http_code'] == 200) {
        $theImgType = explode('/',$http_code['content_type']);

        if($theImgType[0] == 'image'){
            return $theImgType[1];
        }else{
            return false;
        }
    }else{
        return false;
    }
}

/**
 * 分行连续截取字符串
 * @param $str  需要截取的字符串,UTF-8
 * @param int $row  截取的行数
 * @param int $number   每行截取的字数，中文长度
 * @param bool $suffix  最后行是否添加‘...’后缀
 * @return array    返回数组共$row个元素，下标1到$row
 */
function cn_row_substr($str,$row = 1,$number = 10,$suffix = true){
    $result = array();
    for ($r=1;$r<=$row;$r++){
        $result[$r] = &#39;&#39;;
    }

    $str = trim($str);
    if(!$str) return $result;

    $theStrlen = strlen($str);

    //每行实际字节长度
    $oneRowNum = $number * 3;
    for($r=1;$r<=$row;$r++){
        if($r == $row and $theStrlen > $r * $oneRowNum and $suffix){
            $result[$r] = mg_cn_substr($str,$oneRowNum-6,($r-1)* $oneRowNum).&#39;...&#39;;
        }else{
            $result[$r] = mg_cn_substr($str,$oneRowNum,($r-1)* $oneRowNum);
        }
        if($theStrlen < $r * $oneRowNum) break;
    }

    return $result;
}

/**
 * 按字节截取utf-8字符串
 * 识别汉字全角符号，全角中文3个字节，半角英文1个字节
 * @param $str  需要切取的字符串
 * @param $len  截取长度[字节]
 * @param int $start    截取开始位置，默认0
 * @return string
 */
function mg_cn_substr($str,$len,$start = 0){
    $q_str = &#39;&#39;;
    $q_strlen = ($start + $len)>strlen($str) ? strlen($str) : ($start + $len);

    //如果start不为起始位置，若起始位置为乱码就按照UTF-8编码获取新start
    if($start and json_encode(substr($str,$start,1)) === false){
        for($a=0;$a<3;$a++){
            $new_start = $start + $a;
            $m_str = substr($str,$new_start,3);
            if(json_encode($m_str) !== false) {
                $start = $new_start;
                break;
            }
        }
    }

    //切取内容
    for($i=$start;$i<$q_strlen;$i++){
        //ord()函数取得substr()的第一个字符的ASCII码，如果大于0xa0的话则是中文字符
        if(ord(substr($str,$i,1))>0xa0){
            $q_str .= substr($str,$i,3);
            $i+=2;
        }else{
            $q_str .= substr($str,$i,1);
        }
    }
    return $q_str;
}


//使用方法-------------------------------------------------
//数据格式，如没有优惠券coupon_price值为0。
$gData = [
    &#39;pic&#39; => &#39;code_png/nv_img.jpg&#39;,
    &#39;title&#39; =>&#39;chic韩版工装羽绒棉服女冬中长款2017新款棉袄大毛领收腰棉衣外套&#39;,
    &#39;price&#39; => 19.8,
    &#39;original_price&#39; => 119.8,
    &#39;coupon_price&#39; => 100
];
//直接输出
createSharePng($gData,&#39;code_png/php_code.jpg&#39;);
//输出到图片
createSharePng($gData,&#39;code_png/php_code.jpg&#39;,&#39;share.png&#39;);

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