php实现图片的简单上传功能~

<?phpif($_SERVER['REQUEST_METHOD']=='POST'){if(is_uploaded_file($_FILES['upfile']['tmp_name'])){//判断文件是否上传$upfile=($_FILES['upfile']);$name=$upfile['name'];$type=$upfile['type'];$size=$upfile['size'];$tmp_name=$upfile['tmp_name'];$error=$upfile['error'];//限制文件格式只可为：pjpegpnggifjpeg格式！switch($type){case'p_w_picpath/pjpeg':$ok=1;break;case'p_w_picpath/png':$ok=1;break;case'p_w_picpath/gif':$ok=1;break;case'p_w_picpath/jpeg':$ok=1;break;}if($ok&&$error=='0'){move_uploaded_file($tmp_name,'p_w_picpaths/'.$name);echo"上传成功！";}else{echo"非法文件！";//非图片格式，给出提示}}}unset($upfile,$error,$name,$ok,$size,$tmp_name,$type);?><!doctype><html><head><title>上传图片</title></head><body><formaction=""method="post"enctype="multipart/form-data"name="upform">上传文件：<inputtype="file"name="upfile"><inputtype="submit"value="上传"><br></form></body></html>