test.txt

<ul>
    <li class="review-comments-list-odd-layer">
        <span class="review-comment-author"><b>John Doe</b> · <a class="review-comments-comment-button" href="javascript:void(0);" onclick="javascript:openCommentInput(this, false);" >Comment</a></span>
        <span class="review-comment-text">Sloj 1 koji ima popunjene childove</span>
        <div class="review-comments-input">
            <span>Comment Text: </span><br>
            <textarea rows="4" cols="50"></textarea>
            <button href="javascript:void(0);" onclick="javascript:submitReviewComment(this, '<?php echo $_review->getId() ?>', '1');" class="action submit primary">Submit</button>
        </div>
        <ul>
            <li class="review-comments-list-even-layer">
                <span class="review-comment-author"><b>John Doe</b> · <a class="review-comments-comment-button" href="javascript:void(0);" onclick="javascript:openCommentInput(this, false);" >Comment</a></span>
                <span class="review-comment-text">Sloj 1,1 koji ima popunjene childove</span>
                <div class="review-comments-input">
                    <span>Comment Text: </span><br>
                    <textarea rows="4" cols="50"></textarea>
                    <button href="javascript:void(0);" onclick="javascript:submitReviewComment(this, '<?php echo $_review->getId() ?>', '1');" class="action submit primary">Submit</button>
                </div>
                <ul>
                    <li class="review-comments-list-odd-layer">
                        <span class="review-comment-author"><b>John Doe</b> · <a class="review-comments-comment-button" href="javascript:void(0);" onclick="javascript:openCommentInput(this);" >Comment</a></span>
                        <span class="review-comment-text">Sloj 1,1,1 koji ima popunjene childove</span>
                    </li>
                    <li class="review-comments-list-odd-layer">
                        <span class="review-comment-author"><b>John Doe</b> · <a class="review-comments-comment-button" href="javascript:void(0);" onclick="javascript:openCommentInput(this);" >Comment</a></span>
                        <span class="review-comment-text">Sloj 1,1,2 koji ima popunjene childove</span>
                    </li>
                </ul>
            </li>
            <li class="review-comments-list-even-layer">
                <span class="review-comment-author"><b>John Doe</b> · <a class="review-comments-comment-button" href="javascript:void(0);" onclick="javascript:openCommentInput(this);" >Comment</a></span>
                <span class="review-comment-text">Sloj 1,2 koji ima popunjene childove</span>
            </li>
            <li class="review-comments-list-even-layer">
                <span class="review-comment-author"><b>John Doe</b> · <a class="review-comments-comment-button" href="javascript:void(0);" onclick="javascript:openCommentInput(this, false);" >Comment</a></span>
                <span class="review-comment-text">Sloj 1,3 koji ima popunjene childove</span>
            </li>
        </ul>
    </li>
    <li class="review-comments-list-odd-layer">
        <span class="review-comment-author"><b>John Doe</b> · <a class="review-comments-comment-button" href="javascript:void(0);" onclick="javascript:openCommentInput(this);" >Comment</a></span>
        <span class="review-comment-text">Sloj 1,2 koji ima popunjene childove</span>
    </li>
    <li class="review-comments-list-odd-layer">
        <span class="review-comment-author"><b>John Doe</b> · <a class="review-comments-comment-button" href="javascript:void(0);" onclick="javascript:openCommentInput(this);" >Comment</a></span>
        <span class="review-comment-text">Sloj 1,3 koji ima popunjene childove</span>
    </li>
</ul>
---------------------------------------------------------

public function getReviewComments($reviewId, $storeId)
{
    $connection = $this->getConnection();
    $query = "SELECT l1.parent, l1.text AS lev1, l2.parent, l2.text as lev2, l3.parent, l3.text as lev3";
    $query .= " FROM " . $this->getMainTable() . " AS l1";
    $query .= " LEFT JOIN " . $this->getMainTable() . " AS l2 ON l2.parent = l1.comment_id";
    $query .= " LEFT JOIN " . $this->getMainTable() . " AS l3 ON l3.parent = l2.comment_id";
    $query .= " WHERE l1.review_id = '". $reviewId . "' AND l1.store_id = '" . $storeId . "' AND l1.parent IS NULL";
    return $connection->fetchAll($query);
}