Controller.php

<?php
    Route::get('/', function()
    {
        // Return our basic form view
        return View::make("form");
    });
    
    Route::post('/', function()
    {
        // Build the input for our validation
        $input = array('image' => Input::file('image'));
    
        // Within the ruleset, make sure we let the validator know that this
        // file should be an image
        $rules = array(
            'image' => 'image'
        );
    
        // Now pass the input and rules into the validator
        $validator = Validator::make($input, $rules);
    
        // Check to see if validation fails or passes
        if ($validator->fails())
        {
            // Redirect with a helpful message to inform the user that 
            // the provided file was not an adequate type
            return Redirect::to('/')->with('message', 'Error: The provided file was not an image');
        } else
        {
            // Actually go and store the file now, then inform 
            // the user we successfully uploaded the file they chose
            return Redirect::to('/')->with('message', 'Success: File upload was successful');
        }
    });