[請益]上傳檔案大小

[ntouckcm (知足常樂)]

請問一下各位

我做一個可以上傳檔案的ｐｈｐ網頁

預設大小是2MB，若如果上傳超過此大小

echo $_FILES['myfile']['name'].'<br>';
echo $_FILES['myfile']['size'].'<br>' ;
echo $_FILES['myfile']['tmp_name'].'<br>';
echo $_FILES['myfile']['error'].'<br>';

印出來沒東西，不知道為什麼?一直找不到原因
////////////////////////////////////////////////////
<?php
         echo $_FILES['myfile']['name'].'<br>';
         echo $_FILES['myfile']['size'].'<br>' ;
         echo $_FILES['myfile']['tmp_name'].'<br>';
         echo $_FILES['myfile']['error'].'<br>';

$UserName=$_POST['id'];
$NUM=$_POST['HWnum'];
$YEAR=$_POST['year'];
$comment=$_POST['comment'];
$uploaddir = 'D:\\temp\\';
$uploadfile = $uploaddir. $_FILES['myfile']['name'];

if($_FILES['myfile']['size']>0||$_FILES['myfile']['size']<2097152){
        if(is_uploaded_file($_FILES['myfile']['tmp_name'])){
                if(is_writeable(dirname($uploadfile))){

                $time=date("Ymd H:i:s", time());
                $file=$_FILES['myfile']['name'];

move_uploaded_file($_FILES['myfile']['tmp_name'],
                    $uploaddir.$_FILES['myfile']['name']);

$query = "INSERT INTO HW_Upload_Info (UserName,HW_Id ,FileName,UploadTime,
Semester,Comment)
          VALUES ('$UserName','$NUM','$file','$time','$YEAR','$comment')";
          mysql_query($query) or die("無法送出" . mysql_error( ));
          }
                else
                echo '檔案無法寫入！';
         }
         else
         {
         echo '沒有上傳檔案！';
         }
//header("Location:upload_cpp.php?NUM=$NUM");
 }
else{
$error="檔案大小超過限制";
echo $error;
//header("Location:upload_cpp.php?NUM=$NUM&error=$error");
}
?>

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