My simple HTML uploader doesn't work. WHY?

Question

I created simple multifile uploader with html and php. I'm doing it in kohana php framework. Here's the code:

<form method="post" enctype="multipart/form-data" action="/test/test_uploader">
    <input type="file" class="btn btn-mini" name="report_1" />
    <input type="file" class="btn btn-mini" name="report_2"  />
    <input type="file" class="btn btn-mini" name="report_3" />
    <button type="submit" class="btn btn-primary">Zatwierdź</button>
    </form>

test/testuploader code:

print_r($_FILES);

When I try to upload something, it always shows:

Array ( 
        [report_1] => Array ( [name] => [type] => [tmp_name] => [error] => 4 [size] => 0 ) 
        [report_2] => Array ( [name] => [type] => [tmp_name] => [error] => 4 [size] => 0 ) 
        [report_3] => Array ( [name] => [type] => [tmp_name] => [error] => 4 [size] => 0 )
)

It just doesn't upload. WHY?!

Answer 1

PHP Upload Error Codes

UPLOAD_ERR_NO_FILE Value: 4; No file was uploaded.

No file arrived at the server. Did you definitely select one to upload?

Most often I see this error when trying to upload really large files (bigger than the upload_max_filesize and post_max_size php settings.) What size are the files you're trying to upload?