也算是自己对GD扩展的一个熟悉过程吧，之前一直没有认真学习过GD图像处理。
这个类很简单，会根据实际图像的比例，自动调整指定的宽高，也就是按比例缩放。
<?php <br />
//实例化缩略图类<br>
$newimage=new ImageResize();<br>
//将当前目录下的1.jpg生成缩略图并保存到1_lit.jpg，指定的宽度高度分别是644和373像素<br>
$newimage->resize("1.jpg","1_lit.jpg",644,373);<br>
//获取最后一条错误信息，如果生成成功则输出'success'<br>
echo $newimage->GetLastError();<br>
?>
ImageResize.class.zip
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