Limit Photo Size on Upload

[Jim Ault]

You should be able to specify the max file size in the <form> before  
the image is posted.

And this link is a PHP solution that handles several errors and user  
feedback
-- lots of notes on each line so that you know what is going on
--    remember the PHP engine is running on the web host
--    there is a multi-image file upload version at the bottom of this  
page

     http://webdeveloper.com/forum/showthread.php?t=101466

Note the line in the html body

             <input type="hidden" name="MAX_FILE_SIZE" value="<?php  
echo $max_file_size ?>">

thus a hidden value is sent to the server to limit the number of  
characters it will accept when the server creates the variable and  
loads the image data.  The result of trying to upload a very large  
image is that only part of it will be stored in a 'tmp_name' array  
variable in web server RAM,

// now let's move the file to its final location and allocate the new  
filename to it
@move_uploaded_file($_FILES[$fieldname]['tmp_name'], $uploadFilename)
     or error('receiving directory insuffiecient permission',  
$uploadForm);

and the user notified -- the PHP code directs the user to the page  
that outputs the error messages.

// The following function is an error handler which is used
// to output an HTML error page if the file upload fails
function error($error, $location, $seconds = 5)

At the top of the web page source is where the value of the PHP  
variable is set by:

// set a max file size for the html upload form
$max_file_size = 30000; // size in bytes

When you are ready, you can use the download link to get the
      upload.zip or the multifileupload.zip from the author.

I would prefer a PHP solution to a javascript one, but that is my  
preference

Jim Ault
Las Vegas

On Nov 6, 2009, at 11:46 AM, Sivakatirswami wrote:

> Jim Ault wrote:
>
>> One solution is use form validation in the browser before sending.
>> Here is a link to the Apple developer site showing a javascript  
>> example.
>>      http://developer.apple.com/internet/webcontent/validation.html
>> Also, try Googling "html form validation" for hundreds of sites  
>> with info.
>> If a Rev plugin is present, you could use Rev to check the size
>
> Though I try to stay away from JS as much as i can, looks very  
> useful. Only thing is: I don't see a function there to check file  
> size, and further research indicates that JS security constraints  
> bar JS from reading the file size and one can only do this with an  
> ActiveX thing in  I.E.
>
> So, it's back to a server side input data check...or
>
> I'll be patient and wait until next week and implement as a revlet  
> and then it will be easy. This will also constrain input from only  
> those who trust us, which is an excellent "screening" that the  
> revlet security provides.