Uploading Multiple Files with eForm in Evolution CMS

Single-file upload examples are common. Multi-file form flows are where the real edge cases start showing up: nested file arrays, repeated validation, and path creation for each submission.

Typical pattern

The source workflow creates a folder per submission and loops through several uploaded files before sending the report email.

for ($i = 0; $i <= 2; $i++) {
    if ($_FILES['filename']['size'][$i] > 1024*1024*3) {
        // too large
    } else if (is_uploaded_file($_FILES['filename']['tmp_name'][$i])) {
        move_uploaded_file(
            $_FILES['filename']['tmp_name'][$i],
            'uploads/' . $_POST['ses'] . '/' . $_FILES['filename']['name'][$i]
        );
    }
}

What usually goes wrong

• The form field uses array notation, but the PHP side treats it like one file.
• Target folders are not created safely before the move step.
• Validation mixes upload errors and business validation into one unreadable flow.

Safer direction

Create the target directory first, validate each file separately, sanitize filenames, and collect a clean result list before the mail or document-creation step runs. Multi-file uploads are much easier to debug when upload processing is isolated from the rest of the form logic.