upload specific extensions

zedan_80

Hallo

how can i allow file upload to specific extensions ,
for example i want to allow upload ONLY .pdf files

bpat1434

You can use the $_FILES['userfile']['type'] to define what types you can allow.

if($_FILES['userfile']['type'] == 'application/pdf')
{
    // Allow Upload
}
else
{
    // Display error
}

PDF Mime Types are:

application/pdf
application/x-pdf
application/acrobat
applications/vdn.pdf
text/pdf
text/x-pdf

If you want to see an implemented version of allowing only certain uploads, go to here and download PHP Support Tickets (v 1.9) and look in the code (index.php) and look at the upload form to see how to restrict it.

Hope that helps.

~Brett

zedan_80

so i need if statment for each file type,,,right??

bpat1434

You could always make the types an array, and then say:

$types = Array('application/pdf', 'application/x-pdf', 'application/acrobat', 'text/pdf', 'text/x-pdf');

if(in_array($_FILES['userfile']['type'], $types))
{
    // Upload File
}
else
{
    // Don't Upload
}

~Brett

zedan_80

is there any way to limit the extension in side the upload dialog in the files of type field

bpat1434

With JavaScript anything is possible. But I'm not a JS Programmer, so I don't know how to do that. If you're talking about changing the "list" of extensions in the Windows Dialog box, I'm not sure.

~Brett

zedan_80

so i need to use the word "application" before any extension in the array for all extensions?

planetsim

Yes that is correct, you may want to do a google search on MIME Types to get more information about MIME and MIME Types.

Also I do not think it is possible for javascript to get only certain file types when using the upload form field.

Weedpacket

Another check you can make is to see if the first few bytes of the file are %PDF- followed by a version number (e.g., 1.2). All PDF files have to start with that no matter what MIME type the client claims it has.

zedan_80

how can i check that few bytes??
is this rule applied only for PDF files??

Weedpacket

First question: [man]substr[/man].
Second question: what do you mean "only for PDF files"? All PDF files start with those bytes. What other file types do is their own concern. One thing's for sure - if it starts with %PDF- then it can't be a JPEG, a PNG, an executable, an MP3, an email, a zip archive, a Word document, an HTML document, .....