PHP image operation class, supports generating thumbnails, adding watermarks, and uploading thumbnails

<?php
/**
 * @author wolf
 *
 */
class Image {
    //类开始
    public $originimage = ""; //源图片文件地址
    public $imageext = ""; //源图片格式
    public $thumbimage = ""; //缩略图文件存放地址
    public $thumb_maxwidth = 1440; //缩略图最大宽度
    public $thumb_maxheight = 900; //缩略图最大高度
    public $watermark_text = ""; //水印文字内容
    public $watermark_minwidth = 300; //源图片最小宽度：大于此值时加水印
    public $watermark_minheight = 200; //源图片最小高度：大于此值时加水印
    public $watermark_fontfile = ""; //字体文件
    public $watermark_fontsize = 14; //字体大小
    public $watermark_logo = "config/water.png"; //水印LOGO地址
    public $watermark_transparent = 20; //水印LOGO不透明度
    private $origin_width = 0; //源图片宽度
    private $origin_height = 0; //源图片高度
    private $imageQuilty = 90; //图片质量
    private $tmp_originimage = ""; //临时图片(源图片)
    private $tmp_thumbimage = ""; //临时图片(缩略图)
    private $tmp_waterimage = ""; //临时图片(水印LOGO)
    private $_waterPosition = 2; //1正中间 2右下角
    //生成缩略图
    public function gen_thumbimage() {
        if ($this->originimage == "" || $this->thumbimage == "") {
            return 0;
        }
        $this->get_oriwidthheight ();
        if ($this->origin_width < $this->thumb_maxwidth && $this->origin_height < $this->thumb_maxheight) {
            $this->thumb_maxwidth = $this->origin_width;
            $this->thumb_maxheight = $this->origin_height;
        } else {
            if ($this->origin_width < $this->origin_height) {
                $this->thumb_maxwidth = ($this->thumb_maxheight / $this->origin_height) * $this->origin_width;
            } else {
                $this->thumb_maxheight = ($this->thumb_maxwidth / $this->origin_width) * $this->origin_height;
            }
        }
        $this->get_imagetype ();
        $this->gen_tmpimage_origin ();
        $this->gen_tmpimage_thumb ();
        if ($this->tmp_originimage == "" || $this->tmp_thumbimage == "") {
            return - 1;
        }
        imagecopyresampled ( $this->tmp_thumbimage, $this->tmp_originimage, 0, 0, 0, 0, $this->thumb_maxwidth, $this->thumb_maxheight, $this->origin_width, $this->origin_height );
        switch ($this->imageext) {
            case "gif" :
                imagegif ( $this->tmp_thumbimage, $this->thumbimage );
                return 1;
                break;
            case "jpg" :
                imagejpeg ( $this->tmp_thumbimage, $this->thumbimage, $this->imageQuilty );
                return 2;
                break;
            case "png" :
                imagepng ( $this->tmp_thumbimage, $this->thumbimage );
                return 3;
                break;
            default :
                return - 2;
                break;
        }
    }
    //添加文字水印
    public function add_watermark1() {
        if ($this->originimage == "" || $this->watermark_text == "" || $this->watermark_fontfile == "") {
            return 0;
        }
        $this->get_oriwidthheight ();
        if ($this->origin_width < $this->watermark_minwidth || $this->origin_height < $this->watermark_minheight) {
            return 0;
        }
        $this->get_imagetype ();
        $this->gen_tmpimage_origin ();
        if ($this->tmp_originimage == "") {
            return - 1;
        }
        $textcolor = imagecolorallocate ( $this->tmp_originimage, 255, 0, 0 );
        $angle = 0;
        $px = $this->origin_width / 2 - 200;
        $py = $this->origin_height / 2 - 10;
        imagettftext ( $this->tmp_originimage, $this->watermark_fontsize, $angle, $px, $py, $textcolor, $this->watermark_fontfile, $this->watermark_text );
        switch ($this->imageext) {
            case "gif" :
                imagegif ( $this->tmp_originimage, $this->originimage );
                return 1;
                break;
            case "jpg" :
                imagejpeg ( $this->tmp_originimage, $this->originimage, $this->imageQuilty );
                return 2;
                break;
            case "png" :
                imagepng ( $this->tmp_originimage, $this->originimage );
                return 3;
                break;
            default :
                return - 2;
                break;
        }
    }
    //添加LOGO水印
    public function add_watermark2() {
        if ($this->originimage == "" || $this->watermark_logo == "") {
            return 0;
        }
        $this->get_oriwidthheight ();
        if ($this->origin_width < $this->watermark_minwidth || $this->origin_height < $this->watermark_minheight) {
            return 0;
        }
        $this->get_imagetype ();
        $this->gen_tmpimage_origin ();
        $this->gen_tmpimage_waterlogo ();
        if ($this->tmp_originimage == "" || $this->tmp_waterimage == "") {
            return - 1;
        }
        list ( $logo_width, $logo_height ) = getimagesize ( $this->watermark_logo );
        //正中间
        $waterZb = $this->waterPosition ( $logo_width, $logo_height );
        $px = $waterZb [&#39;x&#39;];
        $py = $waterZb [&#39;y&#39;];
        imagecopymerge ( $this->tmp_originimage, $this->tmp_waterimage, $px, $py, 0, 0, $logo_width, $logo_height, $this->watermark_transparent );
        switch ($this->imageext) {
            case "gif" :
                imagegif ( $this->tmp_originimage, $this->originimage );
                return 1;
                break;
            case "jpg" :
                imagejpeg ( $this->tmp_originimage, $this->originimage, $this->imageQuilty );
                return 2;
                break;
            case "png" :
                imagepng ( $this->tmp_originimage, $this->originimage );
                return 3;
                break;
            default :
                return - 2;
                break;
        }
    }
      
    /**
     * 上传缩略图
     * 注意上传文件大小限制
     *@param String $files $_FILES[&#39;upload&#39;] 类型
     *@param String  $path  存储的目录 默认在/static/attached/
     *@param boolean $isWater 是否添加水印
     * @return string $filePath 网页url图片路径
     */
    public function upload($files, $path, $isWater) {
        if (is_uploaded_file ( $files [&#39;tmp_name&#39;] )) {
            $upfile = $files;
            $name = $upfile [name];
            $type = $upfile [type];
            $size = $upfile [size];
            $tmp_name = $upfile [tmp_name];
            $error = $upfile [error];
              
            if ($size > 1048576) {
                return array (&#39;status&#39; => false, &#39;message&#39; => "$name图片太大超过1MB" );
            }
              
            $rs = $this->getImageSize ( $tmp_name );
            if (! $rs [&#39;status&#39;]) {
                $rs [&#39;message&#39;] = $name . $rs [&#39;message&#39;];
                return $rs;
            }
              
            // 创建文件夹
            $save_path = getcwd () . "/static/attached/" . $path . "/";
            $save_url = "./static/attached/" . $path . "/";
            $ym = date ( "Ym" );
            $save_path .= $ym . "/";
            $save_url .= $ym . "/";
            if (! file_exists ( $save_path )) {
                mkdir ( $save_path );
            }
              
            if ($error == &#39;0&#39;) {
                $fileType = substr ( $name, strpos ( $name, "." ) + 1 );
                $prefix = $this->getRandPrefix ();
                $newName = date ( "YmdHi" ) . $prefix . "." . $fileType;
                $filepath = $save_path . $newName;
                move_uploaded_file ( $tmp_name, $filepath );
              
            }
              
            if ($isWater) {
                $this->water ( $filepath );
            }
              
            return array (&#39;status&#39; => true, &#39;message&#39; => $save_url . $newName );
        }
    }
      
    /**
     * 图片增加水印处理
     * @param unknown_type $image
     */
    public function water($image) {
        $this->watermark_logo = ROOT . $this->watermark_logo;
        $this->originimage = $image;
        //LOGO水印
        $this->add_watermark2 ();
    }
      
    /**
     * 
     * 获取随机前缀
     */
    private function getRandPrefix() {
        $string = "abcdefghijklmnopqrstuvwxyz0123456789";
        $prefix = &#39;&#39;;
        for($i = 0; $i < 4; $i ++) {
            $rand = rand ( 0, 33 );
            $prefix .= $string {$rand};
        }
        return $prefix;
    }
      
    //检测图片大小
    private function getImageSize($image) {
        list ( $width, $height, $type, $attr ) = getimagesize ( $image );
          
        if ($type != 2 && $type != 3) {
            return array (&#39;status&#39; => false, &#39;message&#39; => "图片格式不正确,请上传JPG或者PNG图片" . $type );
        }
        //检测图片大小
        if ($width > 1440) {
            return array (&#39;status&#39; => false, &#39;message&#39; => "图片宽度请小于1440px,当前为" . $width . "px" );
        }
          
        if ($height > 900) {
            return array (&#39;status&#39; => false, &#39;message&#39; => "图片高度请小于900px,当前为" . $height . "px" );
          
        }
        return array (&#39;status&#39; => true );
    }
      
    /**
     * 生成缩略图
     * 
     * @param String $imagefile 原始文件
     * @param String $thumbWidth  缩略图宽度
     * @param String $thumbHeight 缩略图高度
     * @return String 缩略图url         
     */
    public function reduceImage($imagefile, $thumbWidth, $thumbHeight, $path = "thumb") {
          
        // 生成缩略图
        $dir = date ( "Ym", time () );
        $imagefile = ROOT . $imagefile;
        $imagefile_s = ROOT . "static/attached/" . $path . "/" . $dir . "/s_" . basename ( $imagefile );
        $imagetrans = new Image ();
        $imagetrans->originimage = $imagefile;
        $imagetrans->thumbimage = $imagefile_s;
        $imagetrans->thumb_maxwidth = $thumbWidth;
        $imagetrans->thumb_maxheight = $thumbHeight;
        $isokid = $imagetrans->gen_thumbimage ();
          
        return "./static/attached/" . $path . "/" . $dir . "/s_" . basename ( $imagefile );
      
    }
    /**
     * 水印位置
     * @param int $logo_width
     * @param int $logo_height
     * @return 水印坐标
     */
    private function waterPosition($logo_width, $logo_height) {
        switch ($this->_waterPosition) {
            case 1 :
                $px = $this->origin_width / 2 - $logo_width / 2;
                $py = $this->origin_height / 2 - $logo_height / 2;
                break;
            case 2 :
                $px = $this->origin_width - $logo_width - 10;
                $py = $this->origin_height - $logo_height - 10;
                break;
            default :
                $px = $this->origin_width / 2 - $logo_width / 2;
                $py = $this->origin_height / 2 - $logo_height / 2;
                break;
        }
          
        return array (&#39;x&#39; => $px, &#39;y&#39; => $py );
    }
    //获取图片尺寸
    private function get_oriwidthheight() {
        list ( $this->origin_width, $this->origin_height ) = getimagesize ( $this->originimage );
        return 1;
    }
    /*
     * 检测图片格式
     * 原方法需要开启exif 扩展
     */
    private function get_imagetype() {
        $ext = $this->getImgext ( $this->originimage );
        switch ($ext) {
            case 1 :
                $this->imageext = "gif";
                break;
            case 2 :
                $this->imageext = "jpg";
                break;
            case 3 :
                $this->imageext = "png";
                break;
            default :
                $this->imageext = "unknown";
                break;
        }
    }
    //创建临时图片(源图片)
    private function gen_tmpimage_origin() {
        $ext = $this->getImgext ( $this->originimage );
        switch ($ext) {
            case 1 :
                $this->tmp_originimage = imagecreatefromgif ( $this->originimage );
                $bgcolor = imagecolorallocate ( $this->tmp_originimage, 0, 0, 0 );
                $bgcolortrans = imagecolortransparent ( $this->tmp_originimage, $bgcolor );
                break;
            case 2 :
                $this->tmp_originimage = imagecreatefromjpeg ( $this->originimage );
                break;
            case 3 :
                $this->tmp_originimage = imagecreatefrompng ( $this->originimage );
                imagesavealpha ( $this->tmp_originimage, true );
                break;
            default :
                $this->tmp_originimage = "";
                break;
        }
    }
    //创建临时图片(缩略图)
    private function gen_tmpimage_thumb() {
        $ext = $this->getImgext ( $this->originimage );
        switch ($ext) {
            case 1 :
                $this->tmp_thumbimage = imagecreatetruecolor ( $this->thumb_maxwidth, $this->thumb_maxheight );
                $bgcolor = imagecolorallocate ( $this->tmp_thumbimage, 255, 255, 255 );
                imagefill ( $this->tmp_thumbimage, 0, 0, $bgcolor );
                break;
            case 2 :
                $this->tmp_thumbimage = imagecreatetruecolor ( $this->thumb_maxwidth, $this->thumb_maxheight );
                break;
            case 3 :
                $this->tmp_thumbimage = imagecreatetruecolor ( $this->thumb_maxwidth, $this->thumb_maxheight );
                $bgcolor = imagecolorallocate ( $this->tmp_thumbimage, 255, 255, 255 );
                imagefill ( $this->tmp_thumbimage, 0, 0, $bgcolor );
                imagealphablending ( $this->tmp_thumbimage, false );
                imagesavealpha ( $this->tmp_thumbimage, true );
                break;
            default :
                $this->tmp_thumbimage = "";
                break;
        }
    }
    //创建临时图片(LOGO水印)
    private function gen_tmpimage_waterlogo() {
        $ext = $this->getImgext ( $this->watermark_logo );
        switch ($ext) {
            case 1 :
                $this->tmp_waterimage = imagecreatefromgif ( $this->watermark_logo );
                $bgcolor = imagecolorallocate ( $this->tmp_waterimage, 0, 0, 0 );
                $bgcolortrans = imagecolortransparent ( $this->tmp_waterimage, $bgcolor );
                break;
            case 2 :
                $this->tmp_waterimage = imagecreatefromjpeg ( $this->watermark_logo );
                break;
            case 3 :
                $this->tmp_waterimage = imagecreatefrompng ( $this->watermark_logo );
                imagesavealpha ( $this->tmp_waterimage, true );
                break;
            default :
                $this->tmp_waterimage = "";
                break;
        }
    }
    /*
     * 获取后缀名
     */
    public function getImgext($filename) {
        return exif_imagetype ( $filename );
    }
    //释放资源
    public function __destruct() {
        if (is_object ( $this->tmp_originimage ) == true) {
            imagedestroy ( $this->tmp_originimage );
        }
        if (is_object ( $this->tmp_thumbimage ) == true) {
            imagedestroy ( $this->tmp_thumbimage );
        }
        if (is_object ( $this->tmp_waterimage ) == true) {
            imagedestroy ( $this->tmp_waterimage );
        }
    }
}