uploadfiles with size and type check in php

fileuploads.php

$logo =  isset($_FILES['logo']) ? $_FILES['logo'] : null;

if ($logo['size'] > 300000) {
    echo 'File size too large';
    return;
}

$type = explode('/', $logo['type']);

if ($type[0] != 'image') {
    http_response_code(403);
    echo 'Only pdf file type is allowed';
    return;
}
if ($logo['error']) {
    http_response_code(409);
    echo 'File could not be uploaded';
    return;
}
$filename = time() . uniqid() . '.' . $type[1];

$uploaded = move_uploaded_file($logo['tmp_name'], '/uploads/company_logo/' . $filename);

if (!$uploaded || ($logo['error'])) {
        http_response_code(409);
        echo 'Company Logo could not uploaded';
        return;
}