Making a nested list with php foreach - php

Question

I'm trying to make a nested list with php by using a foreach loop but I'm kind of stuck now. My code uses a foreach loop and checks if the item is a heading, if it is it will start a nested list below it. The problem now is that if it's not a heading I want to put the corresponding list items into a single ul element below its heading. Now as you can see it puts every single list items that isn't a heading into a seperate ul element of its own because of the foreach loop. How can I fix this?
<ul>
<?php foreach($listitems as $listitem) : ?>
<?php if( $listitem['heading'] == 1) : ?>
<li><?php echo $listitem['listitem']; ?><!--begin nested list-->
<?php endif; ?>
<?php if( $listitem['heading'] == 0) : ?>
<ul><li><?php echo $listitem['listitem']; ?></li></ul>
<?php endif; ?>
<?php endforeach; ?>
</li><!--end nested list-->
</ul>
This is the desired html output:
<ul>
<li>Javascript Basics<!--begin nested list-->
<ul>
<li>Getting Started</li>
<li>Data and Variables</li>
<li>Functions</li>
<li>Scope</li>
<li>Working With Objects</li>
<li>Creating Objects</li>
<li>Arrays</li>
<li>Conditions And Decisions</li>
<li>Loops</li>
</ul>
</li><!--end nested list-->
</ul>

Answer 1

You need to set the inner lists start and end tags when the heading changes.
Something like this
<ul>
<?php
$NonHeadCount = 0;
$HeadingOpen = false;
foreach($listitems as $listitem)
{
if( $listitem['heading'] == 1)
{
$HeadingOpen = true;
if ($NonHeadCount != 0)
{
echo "</ul>";
}
echo "<li>".$listitem['listitem'];
$NonHeadCount = 0;
}
if( $listitem['heading'] == 0)
{
if ($NonHeadCount == 0)
{
echo "<ul>";
}
echo "<li>".$listitem['listitem']."</li>";
}
}
if ($NonHeadCount != 0)
{
echo "</ul>";
}
if ($HeadingOpen)
{
echo "</li>";
}
?>
</ul>

Answer 2

You have to change the $listitems format.
Some like this:
<?php
$listitems = array(
'item1' => array(
'item11',
'item12',
'item13'
),
'item2' => array(
'item21',
'item22',
),
'item3',
'item4'
);
?>
Then, do this:
<?php
echo "<ul>";
foreach($listitems as $item => $listitem):
echo "<li>$item</li>";
if(count($listitem) > 0):
echo "<ul>";
foreach($lisitem as $item):
echo "<li>$item</li>";
endforeach;
echo "</ul>";
endif;
endforeach;
echo "<ul>";
?>