PHP class that implements thumbnails and watermarks

/**
 * Image scaling watermark class
 *
 * @version 1.0;
 *
*/
class cls_photo
{
 protected $waterrate = 0.2; //The ratio of the watermark icon on the image
 protected $width = 300; //The default width of the thumbnail
 protected $height = 200; //Default height of thumbnail
 protected $padding = 5; //Distance from watermark image to edge
 protected $water_mark = "./water.png";
 protected $water_mark_pos = 5; //Watermark image position ( 1=upper left corner, 2=upper right corner, 3=lower left corner, 4=lower right corner, 5 center)
 protected $watermode = 0; // 0 does not print watermark when thumbnail 1 prints watermark when thumbnail
 protected $magick_handle; //Picture operation handle
 protected $format = array('jpg','gif','png','jpeg'); // Picture file format limitation
 protected $smallpic_mode = 2; //Default mode 0 is not generated Thumbnail, 1 is crop scaling, 2 is proportional scaling, 3 is scaling fill mode

 /**
 * Set image parameters
 *
 * @param $arg Image parameters can be put into the array multiple times as follows
 * @param $protected parameter value
 * array(
 * 'waterrate'=>0.2,
 * 'water_mark '=>'./water.png',
 * 'water_mark_pos'=>4,
 * 'smallpic_mode'=>1
 * );
 * @return ture/false
*/
 public function set_args($arg,$val="")
 {
 $params = array( 'waterrate','water_mark','water_mark_pos','smallpic_mode','watermode','width','height');
 if(is_array($arg))
 {
 foreach ($arg as $k => ;$v)
 {
 if(in_array($k,$params))
 {
 $this->$k = $v;
 }
 }
 }
 else
 {
 if(empty($val) )
 {
 return false;
 }
 else
 {
 if(in_array($arg,$params))
 {
 $this->$arg = $val;
 }
 }
 }
 return true;
 }

 /**
 * Image scaling
 *
 * @param $src_file source file path
 * @param $dst_file destination file path
 * @return thumbnail image path/false
*/
 public function scale($src_file,$dst_file="")
 {
 $dst_width = $this->width;
 $dst_height = $this->height;
 $mode = $this->smallpic_mode;
 $magic_water_handle = NewMagickWand();
 if (!MagickReadImage($magic_water_handle, $src_file))return false;

 //Type
 $srcext = strtolower(MagicGetImageFormat($magic_water_handle) );
 if($srcext=='bmp')
 {
 $srcext = 'jpeg';
 }
 if(!in_array($srcext,$this->format))return false;
 //size
 $src_width = MagickGetImageWidth($magic_water_handle);
 $src_height = MagickGetImageHeight($magic_water_handle);

 //Crop scaling mode
 if($mode == 1)
 {
 $pos_x=$pos_y = 0;//Crop Cut temporary position
 $src_widthc = $src_width;//Cut temporary width
 $src_heightc = $src_height;//Cut temporary height
 if($src_width/$src_height>$dst_width/$dst_height)
 {
 $src_widthc = $ SRC_HEIGHT*$ dst_width/$ dst_height;
 $ POS_X = ($ src_width-$ src_widthc)/2; dst_height/$ dst_width;
 $ POS_Y = ($ SRC_HEIGHT -$src_heightc)/2;
 }
 MagickCropImage($magic_water_handle,$src_widthc,$src_heightc,$pos_x,$pos_y);//Crop
 //Because after the MagickCropImage function, the Gif image changes, but the canvas remains unchanged
 $ this->magick_handle = NewMagickWand();
 MagickNewImage($this->magick_handle,$src_widthc,$src_heightc,'#ffffff');
 MagickSetFormat($this->magick_handle,$srcext);
 MagickCompositeImage($ this->magick_handle,$magic_water_handle,MW_OverCompositeOp,0,0);
 //Scale
 MagickScaleImage($this->magick_handle, $dst_width, $dst_height);

 }
 //Proportional scaling mode
 if($ mode == 2)
 {
 if($src_width/$src_height>$dst_width/$dst_height)
 {
 $dst_height=$dst_width*$src_height/$src_width;
 }
 else
 {
 $dst_width=$dst_height * $src_width/$src_height;
 }
            $this->magick_handle=$magic_water_handle;//替换
            MagickScaleImage($this->magick_handle, $dst_width, $dst_height);//缩放
        }
        //缩放填充模式
        if($mode == 3)
        {
            if($src_width/$src_height>$dst_width/$dst_height)
            {
                $dst_heightc=$dst_width*$src_height/$src_width;
                $dst_widthc=$dst_width;
            }
            else
            {
                $dst_widthc=$dst_height*$src_width/$src_height;
                $dst_heightc=$dst_height;
            }
              MagickScaleImage($magic_water_handle, $dst_widthc, $dst_heightc);//缩放
            $this->magick_handle = NewMagickWand();
            MagickNewImage($this->magick_handle,$dst_width,$dst_height,$this->smallpic_bgcolor);
            MagickSetFormat($this->magick_handle,$srcext);
            MagickCompositeImage($this->magick_handle,$magic_water_handle,MW_OverCompositeOp,($dst_width-$dst_widthc)/2,($dst_height-$dst_heightc)/2);
        }
        //打水印
        if($this->watermode == 1)
        {
            $this->set_mark();
        }
        if(empty($dst_file))
        {
            //建立临时文件
            $dst_file = tempnam($_SERVER["SINASRV_CACHE_DIR"],"TMP_IMG");
        }
        MagickWriteImage($this->magick_handle, $dst_file);
        return $dst_file;
    }

    /**
 * Watermarking
 *
 * @param $src_file The path of the image to be watermarked
 * @param $dst_file The file saving path for producing watermarks. If it is empty, a random temporary file will be produced
 * @return The path of the watermark file/false
*/
    public function water_mark($src_file,$dst_file="")
    {
        $this->magick_handle = NewMagickWand();
        if (!MagickReadImage($this->magick_handle, $src_file))
        return false;
        $this->set_mark();
        if(empty($dst_file))
        {
            //建立临时文件
            $dst_file = tempnam($_SERVER["SINASRV_CACHE_DIR"],"TMP_IMG");
        }
        MagickWriteImage($this->magick_handle, $dst_file);
        return $dst_file;
    }

    /**
 * Internal interface
 * Watermark pictures
 *
*/
    protected  function set_mark()
    {

        //尺寸
        $dst_width = MagickGetImageWidth($this->magick_handle);
        $dst_height = MagickGetImageHeight($this->magick_handle);
        //处理水印图
        if ($this->water_mark && is_file($this->water_mark))
        {
            $magic_water_handle = NewMagickWand();
            MagickRemoveImage($magic_water_handle);
            if (MagickReadImage($magic_water_handle, $this->water_mark))
            {
                MagickScaleImage($magic_water_handle, $dst_width*$this->waterrate, $dst_width*$this->waterrate*MagickGetImageHeight($magic_water_handle)/MagickGetImageWidth($magic_water_handle));//缩放水印到图片的1/5
                if ($this->water_mark_pos == 1)
                {
                    $left = $this->padding;
                    $top = $this->padding;
                }
                elseif ($this->water_mark_pos == 2)
                {
                    $left = $dst_width-$this->padding-MagickGetImageWidth($magic_water_handle);
                    $top = $this->padding;
                }
                elseif ($this->water_mark_pos == 3)
                {
                    $left = $this->padding;
                    $top = $dst_height -$this->padding-MagickGetImageHeight($magic_water_handle);
                }
                elseif ($this->water_mark_pos == 4)
                {
                    $left = $dst_width-$this->padding-MagickGetImageWidth($magic_water_handle);
                    $top =$dst_height -$this->padding-MagickGetImageHeight($magic_water_handle);
                }
                elseif ($this->water_mark_pos == 5)
                {
                    $left = ($dst_width-MagickGetImageWidth($magic_water_handle))/2;
                    $top =($dst_height -MagickGetImageHeight($magic_water_handle))/2;
                }
                MagickCompositeImage($this->magick_handle,$magic_water_handle,MW_OverCompositeOp,$left,$top);
            }
        }
    }
}

Waka, php