obflush foreach in php

loop.php

<?php

    $array = ['a', 'b', 'c'];
    if (ob_get_level() == 0) ob_start();
    foreach ($array as $key => $val) {
        echo $key . ' - ' . $val . '<br>';
        ob_flush();
        flush();
        echo '<script>var scrollingElement = (document.scrollingElement || document.body);
        scrollingElement.scrollTop = scrollingElement.scrollHeight;</script>';
    }
    ob_end_flush();

?>