Create/Call a Function so I don't have to insert the same code several times?

I have a very redundant code currently on my website.

This code allows me to display a functionnality for the user provided one of the following condition is met :

• User has full rights


• User has normal rights but is on his main repertory


• User has normal rights but is on one of the subfolders of his main repertory

So currently I have to repeat the full code for every functionnality (about eight).

Here is my code, with the upload functionnality :

<?php
    $directory = $_SESSION['cwd'];                  // current directory
    $user = $_SESSION['simple_auth']['username'];   // get username
    $repository = gatorconf::get('repository');     // get base repertory of the file manager
    $userdir = $repository.DS.'user'.DS.$user;      // user's repertory

    function scanDirectory($userdir = '', $directory){
        $folders = glob($userdir . '/*' , GLOB_ONLYDIR);
        foreach($folders as $folder){
            if (($folder == $directory && gator::checkPermissions('r')) || (gator::checkPermissions('ru')) || ($userdir == $directory && gator::checkPermissions('r'))): ?>
                <!-- The fileinput-button span is used to style the file input field as button -->
                <span class="fileinput-button nice radius button">
                <i class="icon-plus icon-white"></i>

                <span class=""><?php echo lang::get("Add Files...")?></span>

                <input type="file" name="files[]" multiple>
                <input type="hidden" name="uniqid" value="50338402749c1">
                </span>
<?php break; endif;
    scanDirectory($folder, $directory);
        }
    }

    scanDirectory($userdir, $directory);
?>

I'm still new in php and i was wondering if there is a way to simplify this, make the code less redundant, lighter, since I currently have to include this 8 times on my page.

Is there a way to transorm this into some kind of function ? Like write the full code once in a function.php file and then call it on my main page where i would only add he code of the functionnality.

Hope this is clear enough since I'm too sure if that is possible.

Thanks !