targeting nested foreach loop array in php - php

Question

I want to foreach loop through the $tabs['downloads'] subarray element (see bottom of following snippet) within the parent foreach $content['tabs'] loop. My attempt is not working. I get an Invalid argument. Suggestions are appreciated.
Sample of $content array:
$content=
[tabs' => [
0 => [
'label' => 'Afoxé',
'downloads' => [
0 => 'afoxe2.mscz',
1 => 'afoxe2.pdf'],
'content' => "blah blah",
],
]
Nested foreach loop:
<? $i = 1; foreach($content['tabs'] as $key => $tab):
$tabid=$tab['label'] . "-" . $tabsuffix; ?>
<div class="tab-pane fade <?= ($i == 1 ? "show active" : "")?>" id="pills-<?=$tabid?>" role="tabpanel"
aria-labelledby="pills-<?=$tabid?>-tab" tabindex="0">
<?= $Parsedown->text($tab["content"]) ?>
<? foreach($tab['downloads'] as $download): ?>
<a class="btn btn-orange blob text-white" role="button" href="../public/<?= $download ?>"
download="<?= $download ?>"><?= $download ?></a>
<? endforeach; ?>
</div>
<? $i++; endforeach; ?>

Answer 1

The only undefined index I see in your code is the video field.
That is easily fixable with the use of the Null Coalescing Operator. This only works with PHP 7+ What it does is return its first operand if it exists and is not null; otherwise it returns its second operand.
As an alternative you can always use if(isset($tab['video'])) before using the tested key anywhere else.
There is also the $tabsuffix but I will assume that is defined before the foreach.
However, if, for example, not all your entries have the downloads key, you should also handle that:
<? $i = 1;
foreach($content['tabs'] as $key => $tab):
$tabid=$tab['label'] . "-" . $tabsuffix; ?>
<div class="tab-pane fade <?= ($i == 1 ? "show active" : "")?>" id="pills-<?=$tabid?>" role="tabpanel"
aria-labelledby="pills-<?=$tabid?>-tab" tabindex="0">
<? if( stripos(str_replace(' ', '', $tab['video'] ?? ''), '</iframe>' ) !== false ) : // <--- check this line ?>
<div class="ratio ratio-16x9">
<?= $tab["video"] ?>
</div>
<? endif; ?>
<?= $Parsedown->text($tab["content"]) ?>
<? foreach($tab['downloads'] ?? [] as $download): // <--- and this line ?>
<a class="btn btn-orange blob text-white" role="button" href="../public/<?= $download ?>"
download="<?= $download ?>"><?= $download ?></a>
<? endforeach; ?>
</div>
<? $i++; endforeach; ?>
You can see this code working here. I have also added data with a video and one without the downloads key