该如何去调用这个类

<?php <br />
/*<br>
图片处理类：缩略，裁剪，圆角，倾斜<br>
*/<br>
class resizeimage<br>
{<br>
   //图片类型<br>
   var $type;<br>
   //实际宽度<br>
   var $width;<br>
   //实际高度<br>
   var $height;<br>
   //改变后的宽度<br>
   var $resize_width;<br>
   //改变后的高度<br>
   var $resize_height;<br>
   //是否裁图<br>
   var $cut;<br>
   //源图象<br>
   var $srcimg;<br>
   //目标图象地址<br>
   var $dstimg;<br>
   //圆角源<br>
   var $corner;<br>
   var $im;<br>
function resizeimage($img, $corner, $wid, $hei,$c, $corner_radius, $angle)<br>
   {<br>
       $this-&gt;srcimg = $img;<br>
    $this-&gt;corner = $corner;<br>
       $this-&gt;resize_width = $wid;<br>
       $this-&gt;resize_height = $hei;<br>
       $this-&gt;cut = $c;<br>
    $this-&gt;corner_radius = $corner_radius;<br>
    $this-&gt;angle = $angle;<br>
       //图片的类型<br>
       $this-&gt;type = substr(strrchr($this-&gt;srcimg,"."),1);<br>
       //初始化图象<br>
       $this-&gt;initi_img();<br>
       //目标图象地址<br>
       $this -&gt; dst_img();<br>
       //--<br>
       $this-&gt;width = imagesx($this-&gt;im);<br>
       $this-&gt;height = imagesy($this-&gt;im);<br>
       //生成图象<br>
       $this-&gt;newimg();<br>
       ImageDestroy ($this-&gt;im);<br>
   }<br>
   function newimg()<br>
   {<br>
       //改变后的图象的比例<br>
       $resize_ratio = ($this-&gt;resize_width)/($this-&gt;resize_height);<br>
       //实际图象的比例<br>
       $ratio = ($this-&gt;width)/($this-&gt;height);<br>
       if(($this-&gt;cut)=="1")<br>
       //裁图<br>
       {<br>
           if($ratio&gt;=$resize_ratio)<br>
           //高度优先<br>
           {<br>
               $newimg = imagecreatetruecolor($this-&gt;resize_width,$this-&gt;resize_height);<br>
               imagecopyresampled($newimg, $this-&gt;im, 0, 0, 0, 0, $this-&gt;resize_width,$this-&gt;resize_height, (($this-&gt;height)*$resize_ratio), $this-&gt;height);<br>
      $tmp = $this-&gt;rounded_corner($newimg,$this-&gt;resize_width);<br>
               imagepng ($tmp,$this-&gt;dstimg);<br>
           }<br>
           if($ratio
           //宽度优先<br>
           {<br>
               $newimg = imagecreatetruecolor($this-&gt;resize_width,$this-&gt;resize_height);<br>
               imagecopyresampled($newimg, $this-&gt;im, 0, 0, 0, 0, $this-&gt;resize_width, $this-&gt;resize_height, $this-&gt;width, (($this-&gt;width)/$resize_ratio));<br>
      $tmp = $this-&gt;rounded_corner($newimg);<br>
               imagepng ($tmp,$this-&gt;dstimg);<br>
           }<br>
       }<br>
       else<br>
       //不裁图<br>
       {<br>
           if($ratio&gt;=$resize_ratio)<br>
           {<br>
               $newimg = imagecreatetruecolor($this-&gt;resize_width,($this-&gt;resize_width)/$ratio);<br>
               imagecopyresampled($newimg, $this-&gt;im, 0, 0, 0, 0, $this-&gt;resize_width, ($this-&gt;resize_width)/$ratio, $this-&gt;width, $this-&gt;height);<br>
               ImageJpeg ($newimg,$this-&gt;dstimg);<br>
           } <div class="clear"></div>