to limit attachment file size

[noraien]

Hi.....I am developing a system which allows a user to attach file.But, the problem is,I do not know how to limit the size of the attachment file.I am using php,html and javascript.

[cgraz]

From php.net: http://www.php.net/manual/en/features.file-upload.php

<form enctype="multipart/form-data" action="_URL_" method="post">
<input type="hidden" name="MAX_FILE_SIZE" value="30000">
Send this file: <input name="userfile" type="file">
<input type="submit" value="Send File">
</form>

The URL should point to a PHP file. The MAX_FILE_SIZE hidden field must precede the file input field and its value is the maximum filesize accepted. The value is in bytes.

Then when you process the form, for added security, you can access the file size (once again, in bytes) using $_FILES['userfile']['size'] where userfile is the name of your file input. Then, run an if statement to make sure it's not bigger than what you want it to be.

Cgraz

[jjoske]

A better way to do it if you have root access is the change the value for max file upload size in either the php config file or the Apache config file. Setting the max file size in the form is very easy to get around.

[noraien]

thanks a lot for the help.but, where should I put those codes?

[ferum]

Originally posted by noraien
thanks a lot for the help.but, where should I put those codes?

you should put those codes in the html file where you display the upload form.

[noraien]

yes, of course...but where to put the codes?at the submit button or at the input field?

[ferum]

Originally posted by noraien
yes, of course...but where to put the codes?at the submit button or at the input field?

just copy the codes, create a new html document, paste the codes and save it. no need to put into submit/input field because it is not a field value...