/**
 * 生成宣传海报
 * @param array  参数,包括图片和文字
 * @param string  $filename 生成海报文件名,不传此参数则不生成文件,直接输出图片
 * @return [type] [description]
 */
function createPoster($config=array(),$filename="")
{
    #如果要看报什么错，可以先注释调这个header
    if(empty($filename)) header("content-type: image/png");
    $imageDefault = [
        ‘left‘=>0,
        ‘top‘=>0,
        ‘right‘=>0,
        ‘bottom‘=>0,
        ‘width‘=>100,
        ‘height‘=>100,
        ‘opacity‘=>100
    ];
    $textDefault = [
        ‘text‘=>‘‘,
        ‘left‘=>0,
        ‘top‘=>0,
        ‘fontSize‘=>32,       //字号
        ‘fontColor‘=>‘255,255,255‘, //字体颜色
        ‘angle‘=>0,
    ];

    $background = $config[‘background‘];//海报最底层得背景

    #背景方法
    $backgroundInfo = getimagesize($background);
    $backgroundFun = ‘imagecreatefrom‘.image_type_to_extension($backgroundInfo[2], false);
    $background = $backgroundFun($background);
    $backgroundWidth = imagesx($background);  //背景宽度
    $backgroundHeight = imagesy($background);  //背景高度
    $imageRes = imageCreatetruecolor($backgroundWidth,$backgroundHeight);
    $color = imagecolorallocate($imageRes, 0, 0, 0);
    imagefill($imageRes, 0, 0, $color);

    // imageColorTransparent($imageRes, $color);  //颜色透明
    imagecopyresampled($imageRes,$background,0,0,0,0,imagesx($background),imagesy($background),imagesx($background),imagesy($background));

    #处理图片
    if(!empty($config[‘image‘])){
        foreach ($config[‘image‘] as $key => $val) 
        {
            $val = array_merge($imageDefault,$val);
            $info = getimagesize($val[‘url‘]);
            $function = ‘imagecreatefrom‘.image_type_to_extension($info[2], false);

            #如果传的是字符串图像流
            if($val[‘stream‘])
            {   
                $info = getimagesizefromstring($val[‘url‘]);
                $function = ‘imagecreatefromstring‘;
            }
            $res = $function($val[‘url‘]);
            $resWidth = $info[0];
            $resHeight = $info[1];

            #建立画板 ，缩放图片至指定尺寸
            $canvas=imagecreatetruecolor($val[‘width‘], $val[‘height‘]);
            imagefill($canvas, 0, 0, $color);

            #关键函数，参数（目标资源，源，目标资源的开始坐标x,y, 源资源的开始坐标x,y,目标资源的宽高w,h,源资源的宽高w,h）
            imagecopyresampled($canvas, $res, 0, 0, 0, 0, $val[‘width‘], $val[‘height‘],$resWidth,$resHeight);
            $val[‘left‘] = $val[‘left‘]<0?$backgroundWidth- abs($val[‘left‘]) - $val[‘width‘]:$val[‘left‘];
            $val[‘top‘] = $val[‘top‘]<0?$backgroundHeight- abs($val[‘top‘]) - $val[‘height‘]:$val[‘top‘];
            #放置图像
            imagecopymerge($imageRes,$canvas, $val[‘left‘],$val[‘top‘],$val[‘right‘],$val[‘bottom‘],$val[‘width‘],$val[‘height‘],$val[‘opacity‘]);//左，上，右，下，宽度，高度，透明度
        }
    }

    #处理文字
    if(!empty($config[‘text‘]))
    {
        foreach ($config[‘text‘] as $key => $val) 
        {
            $val = array_merge($textDefault,$val);
            list($R,$G,$B) = explode(‘,‘, $val[‘fontColor‘]);
            $fontColor = imagecolorallocate($imageRes, $R, $G, $B);
            $val[‘left‘] = $val[‘left‘]<0?$backgroundWidth- abs($val[‘left‘]):$val[‘left‘];
            $val[‘top‘] = $val[‘top‘]<0?$backgroundHeight- abs($val[‘top‘]):$val[‘top‘];
            imagettftext($imageRes,$val[‘fontSize‘],$val[‘angle‘],$val[‘left‘],$val[‘top‘],$fontColor,$val[‘fontPath‘],$val[‘text‘]);
        }
    }
    
    #生成图片
    if(!empty($filename))
    {
        $res = imagejpeg ($imageRes,$filename,90); //保存到本地
        imagedestroy($imageRes);
        if(!$res) return false;
        return $filename;
    }else{
        imagejpeg ($imageRes);     //在浏览器上显示
        imagedestroy($imageRes);
    }
}

#两张调用
function addTwoimage($reqrcode,$bjimg,$filename)
{
    $reqrcodes = ROOT_PATH . ‘/public‘.$reqrcode; //背景图目录
    // $reqrcodes = ROOT_PATH . ‘/public‘; //背景图目录
    $config = array(
            ‘image‘=>array(
                array(
                    ‘url‘=>$reqrcodes,      //二维码资源
                    ‘stream‘=>0,
                    ‘left‘=>177,
                    ‘top‘=>470,
                    ‘right‘=>0,
                    ‘bottom‘=>0,
                    ‘width‘=>400,
                    ‘height‘=>400,
                    ‘opacity‘=>100
                )
            ),
            // ‘background‘=>ROOT_PATH . ‘public/upload/erweima.jpg‘ //背景图目录
            ‘background‘=>ROOT_PATH . ‘public/‘.$bjimg //背景图目录
        );
        
    return createPoster($config,$filename);
}
#多张图片+文字调用
function addTwoimages($reqrcode,$erweima,$name,$total,$filename)
{
    $reqrcodes = ROOT_PATH . ‘/public‘.$reqrcode; //合并上图所在路径
    $reqrcodes2 = ROOT_PATH . ‘/public‘.$erweima; //合并上图所在路径

    $config = array(
        ‘text‘=>array(
            array(
                ‘text‘=>$name,
                ‘left‘=>60,
                ‘top‘=>1020, 
                ‘fontPath‘=>ROOT_PATH.‘public/upload/goodsttf/1.ttf‘,    //字体文件
                ‘fontSize‘=>28,             //字号
                ‘fontColor‘=>‘0,0,0‘,       //字体颜色
                ‘angle‘=>0,
            ),
            array(
                ‘text‘=>$total,
                ‘left‘=>60,
                ‘top‘=>1240,
                ‘fontPath‘=>ROOT_PATH.‘public/upload/goodsttf/1.ttf‘,    //字体文件
                ‘fontSize‘=>32,             //字号
                ‘fontColor‘=>‘0,0,0‘,       //字体颜色
                ‘angle‘=>0,
            )
        ),
       ‘image‘=>array(
            array(
                ‘url‘=>$reqrcodes,       //图片资源路径
                ‘left‘=>0,
                ‘top‘=>0,
                ‘stream‘=>0,             //图片资源是否是字符串图像流
                ‘right‘=>0,
                ‘bottom‘=>0,
                ‘width‘=>1000,
                ‘height‘=>900,
                ‘opacity‘=>100
            ),
            array(
                ‘url‘=>$reqrcodes2,
                ‘left‘=>620,
                ‘top‘=>940,
                ‘right‘=>0,
                ‘stream‘=>0,
                ‘bottom‘=>0,
                ‘width‘=>340,
                ‘height‘=>340,
                ‘opacity‘=>100
            ),
        ),
        // ‘background‘=>‘qrcode/bjgoods.jpg‘,
       ‘background‘ => ROOT_PATH.‘public/upload/config/bjgoods.png‘,  #最底部背景图
    );
    return  createPoster($config,$filename);
}