如何上传文件到服务器硬盘上?50分

Question

把下边的代码改改吧。
<?php 
$photodir = "./upload";
if(strval($Image1)=="") 
{
echo "<form action=\"\" enctype=\"multipart/form-data\" method=post>
<font color=blue><B>选择图片:</B> <input type=\"file\" name=\"Image1\" size=\"42\">  ";
echo "<p align=center><input type=button value=取消 onclick=self.close();><input type=submit value=上传></p>
</form> ";
}if(strval($Image1 != ""))
{
function checkImgType($image_type,$image_name){
if((strcmp($image_type,"image/jpeg")==0)||(strcmp($image_type,"image/gif")==0)|| (strcmp($image_type,"image/pjpeg")==0)||(strcmp($image_type,"image/jpg")==0))
        {
                 switch($image_type){
                         case "image/jpg":
                         $imageExt=".jpg";
                         break;
                         case "image/jpeg":
                         $imageExt=".jpg";
                         break;
                         case "image/pjpeg":
                         $imageExt=".jpg";
                         break;
                         case "image/gif":
                         $imageExt=".gif";
                         break;
                 }
                 return $imageExt;
        }
        else{
                print "<b><font color=red>$image_name 文件格式不对，不能上传！<br>
                       请选择JPEG (.jpg) 或 GIF (.gif)类型的文件！</font></b><br> <br>";                return 0;
        }}
$IMAGES_DIR="$photodir/";if($Image1!="none"){
 $Image1Ext=checkImgType($Image1_type,$Image1_name);
}
if($Image1Ext=='0')
{
$Image1 = "";
echo '<br><div align="center"><b><blink>请重新选择图片！</blink></b></div>';
exit;
}if($Image1!="none")
{ $Image1_name = ereg_replace(" ", "_",$Image1_name);
$Image1_disp = ereg_replace("_", " ", $Image1_name);
$Image1Final="$IMAGES_DIR$Image1_name";copy($Image1, $Image1Final);
echo "Image1Final=".$Image1Final."<br>";
echo "Image1_name=".$Image1_name."<br>";
echo "Image1_disp=".$Image1_disp."<br>";
echo "Image1_size=".$Image1_size."<br>";
echo "Image1=".$Image1."<br>";
unlink($Image1);
chmod("$IMAGES_DIR$Image1_name", 0777);
}
}
?>