Image 水印图片 和 缩略图

<?phpclass Image{    //路径    public $path = './';    //初始化路径    public function __construct($path = './')    {        $this->path = rtrim($path , '/') . '/';    }    //判断路径是否存在    //获取文件信息    //判断目标图片大小是否大于水印图片大小    //获取位置 1-9  非0-9的就是随机    //打开图片    //合并图片    //保存图片    //销毁图片    public function water($dst , $src , $isRand = true , $prefix = 'water_' , $opacity =100 , $position = 110)    {        //目标图片路径        $dst = $this->path . $dst;        //水印图片路径        $src = $this->path . $src;        if (!file_exists($dst)) {            exit('目标图片不存在');        }        if (!file_exists($src)) {            exit('水印图片不存在');        }        //开始比较大小（获取所有的图片信息）        $dstInfo = self::getImageInfo($dst);        $srcInfo = self::getImageInfo($src);        //比较        if (!$this->checkSize($dstInfo , $srcInfo)) {            exit('水印图片太大');        }        ////获取位置 1-9  非0-9的就是随机        $position = self::getPosition($dstInfo , $srcInfo , $position);        //打开图片        $dstRes = self::openImg($dst , $dstInfo);        $srcRes = self::openImg($src , $srcInfo); // mime        //开始合并        $newRes = self::mergeImg($dstRes , $srcRes , $srcInfo , $position , $opacity);        //处理随机        if ($isRand) {            $newPath = $this->path . $prefix . uniqid() . $dstInfo['name'];        } else {            $newPath = $this->path . $prefix . $dstInfo['name'];        }        //保存图片        self::saveImg($newPath , $newRes , $dstInfo);        //销毁资源        imagedestroy($dstRes);        imagedestroy($srcRes);    }    //缩略图    public function thumb($img, $width, $height, $prefix = 'thumb_')    {        if (!file_exists($img)) {            exit('文件路径不正在');        }        $info = self::getImageInfo($img);        $newSize = self::getNewSize($width,$height,$info);        $res = self::openImg($img, $info);        $newRes = self::kidOfImage($res,$newSize,$info);        $newPath = $this->path.$prefix.$info['name'];        self::saveImg($newPath,$newRes,$info);        imagedestroy($newRes);        return $newPath;    }    private static function kidOfImage($srcImg, $size, $imgInfo)    {        $newImg = imagecreatetruecolor($size["width"], $size["height"]);               $otsc = imagecolortransparent($srcImg);        if ( $otsc >= 0 && $otsc < imagecolorstotal($srcImg)) {             $transparentcolor = imagecolorsforindex( $srcImg, $otsc );                 $newtransparentcolor = imagecolorallocate(                 $newImg,                 $transparentcolor['red'],                     $transparentcolor['green'],                 $transparentcolor['blue']             );             imagefill( $newImg, 0, 0, $newtransparentcolor );             imagecolortransparent( $newImg, $newtransparentcolor );        }        imagecopyresized( $newImg, $srcImg, 0, 0, 0, 0, $size["width"], $size["height"], $imgInfo["width"], $imgInfo["height"] );        imagedestroy($srcImg);        return $newImg;    }    private static function getNewSize($width, $height, $imgInfo)    {           //将原图片的宽度给数组中的$size["width"]        $size["width"] = $imgInfo["width"];           //将原图片的高度给数组中的$size["height"]        $size["height"] = $imgInfo["height"];         if($width < $imgInfo["width"]) {            //缩放的宽度如果比原图小才重新设置宽度            $size["width"] = $width;                     }        if ($width < $imgInfo["height"]) {            //缩放的高度如果比原图小才重新设置高度            $size["height"] = $height;               }        if($imgInfo["width"]*$size["width"] > $imgInfo["height"] * $size["height"]) {            $size["height"] = round($imgInfo["height"] * $size["width"] / $imgInfo["width"]);        } else {            $size["width"] = round($imgInfo["width"] * $size["height"] / $imgInfo["height"]);        }        return $size;    }    //保存图片    public static function saveImg($path , $res , $info)    {        //imagepng();        switch ($info['mime']) {            case 'image/jpeg':            case 'image/jpg':            case 'image/pjpeg':                imagejpeg($res, $path);                break;            case 'image/bmp':            case 'image/wbmp':                imagewbmp($res, $path);                break;            case 'image/gif':                imagegif($res, $path);                break;            case 'image/png':            case 'image/x-png':                imagepng($res, $path);                break;        }    }    //合并图片    public static function mergeImg($dstRes , $srcRes , $srcInfo , $position , $opacity)    {        imagecopymerge($dstRes , $srcRes , $position['x'] , $position['y'] , 0 , 0 ,$srcInfo['width'] , $srcInfo['height'] , $opacity );        return $dstRes;    }    //打开图片    public static function openImg($path , $info)    {        switch ($info['mime']) {            case 'image/jpeg':            case 'image/jpg':            case 'image/pjpeg':                $res = imagecreatefromjpeg($path);                break;            case 'image/bmp':            case 'image/wbmp':                $res = imagecreatefromwbmp($path);                break;            case 'image/gif':                $res = imagecreatefromgif($path);                break;            case 'image/png':            case 'image/x-png':                $res = imagecreatefrompng($path);                break;        }        return $res;    }    //获取图片位置    public static function getPosition($dstInfo , $srcInfo , $position)    {        switch($position) {            case 1:                $x = 0;                $y = 0;                break;            case 2:                $x = ($dstInfo['width'] - $srcInfo['width']) / 2;                $y = 0;                break;            case 3:                $x = $dstInfo['width'] - $srcInfo['width'];                $y = 0;                break;            case 4:                $x = 0;                $y = ($dstInfo['height'] - $srcInfo['height']) / 2;                break;            case 5:                $x = ($dstInfo['width'] - $srcInfo['width']) / 2;                $y = ($dstInfo['height'] - $srcInfo['height']) / 2;                break;            case 6:                $x = $dstInfo['width'] - $srcInfo['width'];                $y = ($dstInfo['height'] - $srcInfo['height']) / 2;                break;            case 7:                $x = 0;                $y = $dstInfo['height'] - $srcInfo['height'];                break;            case 8:                $x = ($dstInfo['width'] - $srcInfo['width']) / 2;                $y = $dstInfo['height'] - $srcInfo['height'];                break;            case 9:                $x = $dstInfo['width'] - $srcInfo['width'];                $y = $dstInfo['height'] - $srcInfo['height'];                break;            default:                $x = mt_rand(0 , $dstInfo['width'] - $srcInfo['width']);                $y = mt_rand(0 , $dstInfo['height'] - $srcInfo['height']);                break;        }        return [            'x' => $x,            'y' => $y        ];    }    //比较大小的函数    public function checkSize($dstInfo , $srcInfo)    {        if ($dstInfo['width'] < $srcInfo['width']) {            return false;        }        if ($dstInfo['height'] < $srcInfo['height']) {            return false;        }        return true;    }    //获取图片信息    public static function getImageInfo($path)    {        //var_dump($path);        $data = getimagesize($path);        //var_dump($data);        $info['width'] = $data[0];        $info['height'] = $data[1];        $info['mime'] = $data['mime'];        $info['name'] = basename($path);        return $info;    }}$img = new Image();//$img->water('原图名字.jpg' , '水印图片名字.jpg');$img->thumb('原图名字 .jpg' , 100 , 100 , 'thumb1_'); //加上前缀$img->thumb('原图名字 .jpg' , 200 , 200 , 'thumb2_');$img->thumb('原图名字 .jpg' , 300 , 300 , 'thumb3_');