1.˵
  ͼзPIPHP_MakeThumbnailҪһΪҪתGDͼ񣬵ڶΪͼȻ߸߶ȣȡĸȽϴ󣩡
2.ʹ˵
  һزļ
  ڶʵļõ¶
  ʹöPIPHP_MakeThumbnailĲ
  ķֵΪõͼֱűλá