该怎么去调用这个类？
<?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->srcimg = $img;<br>
$this->corner = $corner;<br>
$this->resize_width = $wid;<br>
$this->resize_height = $hei;<br>
$this->cut = $c;<br>
$this->corner_radius = $corner_radius;<br>
$this->angle = $angle;<br>
//图片的类型<br>
$this->type = substr(strrchr($this->srcimg,"."),1);<br>
//初始化图象<br>
$this->initi_img();<br>
//目标图象地址<br>
$this -> dst_img();<br>
//--<br>
$this->width = imagesx($this->im);<br>
$this->height = imagesy($this->im);<br>
//生成图象<br>
$this->newimg();<br>
ImageDestroy ($this->im);<br>
}<br>
function newimg()<br>
{<br>
//改变后的图象的比例<br>
$resize_ratio = ($this->resize_width)/($this->resize_height);<br>
//实际图象的比例<br>
$ratio = ($this->width)/($this->height);<br>
if(($this->cut)=="1")<br>
//裁图<br>
{<br>
if($ratio>=$resize_ratio)<br>
//高度优先<br>
{<br>
$newimg = imagecreatetruecolor($this->resize_width,$this->resize_height);<br>
imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, $this->resize_width,$this->resize_height, (($this->height)*$resize_ratio), $this->height);<br>
$tmp = $this->rounded_corner($newimg,$this->resize_width);<br>
imagepng ($tmp,$this->dstimg);<br>
}<br>
if($ratio
//宽度优先<br>
{<br>
$newimg = imagecreatetruecolor($this->resize_width,$this->resize_height);<br>
imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, $this->resize_width, $this->resize_height, $this->width, (($this->width)/$resize_ratio));<br>
$tmp = $this->rounded_corner($newimg);<br>
imagepng ($tmp,$this->dstimg);<br>
}<br>
}<br>
else<br>
//不裁图<br>
{<br>
if($ratio>=$resize_ratio)<br>
{<br>
$newimg = imagecreatetruecolor($this->resize_width,($this->resize_width)/$ratio);<br>
imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, $this->resize_width, ($this->resize_width)/$ratio, $this->width, $this->height);<br>
ImageJpeg ($newimg,$this->dstimg);<br>
} <div class="clear">
</div>
