Image Uploads

Anon

2 questions

1st Question:

When I upload a file from the client side how do I maintain the file extension?

This is the method that I am currently using(I am sure there is a better way)

**************Upload Form*****************

This is the form

$file_id = date("Hisz");

**************Upload Function*****************

This is the function executed after the form is submited

function do_upload($userfile,$newname)

{

$new_file = 'agents/'.$newname.'.jpg';

if (!copy($userfile, $new_file)) echo "failed to copy file $userfile to $new_file\n";
return;
}

So when the function transfers the file from the tmp directory the name is changes to a string like so 11249493809. however I am not sure how to identify what type of image it is so hardcoded .jpg for extension(I want to dynamically save the file as its original type)

How do I mainain the file estension?

2nd question:

How can I dymanically resize the image to a standard dimension?

Example

if the user uploads a .jpg that is 1024X700px

I want to save the file size as 800X600px

I did not find a function i the manual for this

Thanks for your help in advance

geo115fr

1st question :
$userfile_type should contain the image type ie "image/gif" or "image/jpeg" or "image/png" or "image/bmp"
This is not 100% sure as it relies on what the user's browser is sending (I could not have it working properly with Netscape 4.77).
So you could in addition check the file extension :
substr(strrchr($userfile_name,"."),1)

2nd question :
There are many ways, depending on the setup of your server.
The easiest is to use the GD library of php (see manual chapter on Images) provided that jpeg processing is included within your GD (not by default).
Otherwise you could call fom php a dedicated software such as ImageMagick (for Linux) provided that the softawaer is available on your server.

Anon

OK I understand that I need to choose the type of files that the client can upload

<1>********************************
<input type="File" name="userfile" size="30" maxlength="255" accept="image/jpeg, image/pjpeg, image/gif, image/bmp, image/png">
</1>

thats no problem, my problem is how do I maintain the file extension when I rename the file and upload the file to a new directory from the temp directory?

<2>*********************************
$file_id = date("Hisz");

</2>

I rename the file so the file name is uniq in the folder directory

So Now I upload the file

<3>**********************************
function do_upload($userfile,$newname)
{
$new_file = 'agents/'.$newname.'.jpg';

if (!copy($userfile, $new_file)) echo "failed to copy file $userfile to $new_file\n";
return;
}

</3>

If you notice I have added .jpg to the end of the $new_file variable

If I dont do this the file saves with no extension

Thanks

geo115fr

I am not sure to understand what you mean by "maintain the file extension"...

If you want the file name in the server to have the same extension that the original file on the client, then you could code :

function do_upload($userfile,$newname)
global $userfile_name;
{
$ext=strrchr($userfile_name,".");
$new_file = 'agents/'.$newname.$ext;
...
}

you can also define $ext based on $userfile_type as I mentionned earlier.