php生成海报

一、方法

**
 * 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 = array(
        'left'=>0,
        'top'=>0,
        'right'=>0,
        'bottom'=>0,
        'width'=>100,
        'height'=>100,
        'opacity'=>100
    );
    $textDefault = array(
        '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($background));
    //处理了图片
    if(!empty($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);
            if($val['stream']){   //如果传的是字符串图像流
                $info = getimagesizefromstring($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);
    }
}

二、使用方法

1.生成带二维码的图片

$config = array(
    'image'=>array(
        array(
            'url'=>'qrcode/qrcode.png',     //二维码资源
            'stream'=>0,
            'left'=>116,
            'top'=>-216,
            'right'=>0,
            'bottom'=>0,
            'width'=>178,
            'height'=>178,
            'opacity'=>100
        )
    ),
    'background'=>'bg/bg1.jpg'          //背景图
);
$filename = 'bg/'.time().'.jpg';
//echo createPoster($config,$filename);
echo createPoster($config);

2.生成多内容海报

$config = array(
    'text'=>array(
        array(
            'text'=>'昵称',
            'left'=>182,
            'top'=>105,
            'fontPath'=>'qrcode/simhei.ttf',     //字体文件
            'fontSize'=>18,             //字号
            'fontColor'=>'255,0,0',       //字体颜色
            'angle'=>0,
        )
    ),
    'image'=>array(
        array(
            'url'=>'qrcode/qrcode.png',       //图片资源路径
            'left'=>130,
            'top'=>-140,
            'stream'=>0,             //图片资源是否是字符串图像流
            'right'=>0,
            'bottom'=>0,
            'width'=>150,
            'height'=>150,
            'opacity'=>100
        ),
        array(
            'url'=>'https://wx.qlogo.cn/mmopen/vi_32/DYAIOgq83eofD96opK97RXwM179G9IJytIgqXod8jH9icFf6Cia6sJ0fxeILLMLf0dVviaF3SnibxtrFaVO3c8Ria2w/0',
            'left'=>120,
            'top'=>70,
            'right'=>0,
            'stream'=>0,
            'bottom'=>0,
            'width'=>55,
            'height'=>55,
            'opacity'=>100
        ),
    ),
    'background'=>'qrcode/bjim.jpg',
);
$filename = 'qrcode/'.time().'.jpg';
//echo createPoster($config,$filename);
echo createPoster($config);