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Editorial Team
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Asked: 2026-06-03T01:43:19+00:00

I would like to diplay comments on my site like this: <li>Parent <ul> <li>child

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I would like to diplay comments on my site like this:

<li>Parent
    <ul>
        <li>child one</li>
        <li>child two
            <ul>
                <li>grandchild</li>
                <li>other grandchild</li>
            </ul>
        </li>
     </ul>
<li>Another parent with no children</li>
<li>

I have read the following article, however it doesn’t use <li>. So is there a way to display comments like I’ve done before with an array like so? Thanks.

$comments = array(
      array('id'=>1, 'parent_id'=>NULL,   'text'=>'Parent'),
      array('id'=>2, 'parent_id'=>1,      'text'=>'Child'),
      array('id'=>3, 'parent_id'=>2,      'text'=>'Child Third level'),
      array('id'=>4, 'parent_id'=>NULL,   'text'=>'Second Parent'),
      array('id'=>5, 'parent_id'=>4,      'text'=>'Second Child')
);
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1 Answer

  1. Editorial Team

    I asssume your comment table has id, parent_id, comment, … and my suggestion goes like this;

    Select you comments like;

    $sql = "SELECT *FROM comments ORDER BY id DESC";

$rows = mysql_query($sql);

    And next step is array operations.You can see the following code below and try working demo here;

    $rows = your_select_result;//I assumed that you have done these stuffs
$comments = $row;
/**
This is test data, please remove this array while you are
running own application.Since you will use the data one you get your db
**/
$comments = array(
    1 => array('id' => 1, 'parent_id' => 0, 'childs' => array()),
    2 => array('id' => 2, 'parent_id' => 0, 'childs' => array()),
    3 => array('id' => 3, 'parent_id' => 0, 'childs' => array()),
    5 => array('id' => 5, 'parent_id' => 0, 'childs' => array()),
    11 => array('id' => 11, 'parent_id' => 0, 'childs' => array()),
    17 => array('id' => 17, 'parent_id' => 0, 'childs' => array()),
    23 => array('id' => 23, 'parent_id' => 0, 'childs' => array()),
    28 => array('id' => 28, 'parent_id' => 0, 'childs' => array()),
    4 => array('id' => 4, 'parent_id' => 1, 'childs' => array()),
    6 => array('id' => 6, 'parent_id' => 1, 'childs' => array()),
    8 => array('id' => 8, 'parent_id' => 2, 'childs' => array()),
    9 => array('id' => 9, 'parent_id' => 2, 'childs' => array()),
    7 => array('id' => 7, 'parent_id' => 3, 'childs' => array()),
    12 => array('id' =>12, 'parent_id' => 7, 'childs' => array()),
    13 => array('id' => 13, 'parent_id' => 12, 'childs' => array()),
);

/** Comment prepare start */
foreach ($comments as $k => &$v) {
    if ($v['parent_id'] != 0) {
        $comments[$v['parent_id']]['childs'][] =& $v;
    }
}
unset($v);

foreach ($comments as $k => $v) {
    if ($v['parent_id'] != 0) {
        unset($comments[$k]);
    }
}

/** Comment prepare end */

//Your indent pattern
function indent($size) {
    $string = "";
    for ($i = 0; $i < $size; $i++) {
        $string .= "#";
    }
    echo $string; 
}


function printComments($comments, $indent = 0) {
    foreach ($comments as $comment) {
        echo indent($indent + 1).' I am comment '.$comment['id']."\n";
        if (!empty($comment['childs'])) {
            printComments($comment['childs'], $indent + 1);
        }
        }
}


printComments($comments);

    For demo please see here

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