getting only certain entries of the database - php

Question

The code bellow gets a few domains from my database and outputs them in a dropdown list. I need some help as I can't get this change i want to make work.
I want to show only the domains where in the database premium_only is set to 6, nothing else. If I try to change the if statement to $shortUrlDomain['premium_only'] == 6 I can't see any domains appear in the list which has premium_only set to 6 in the database. Why?
Database layout:
id | domain | premium_only | status | date_created
---+-------------+--------------+---------+-------------------
1 | exaple.com | 0 | enabled | 2020-03-02 08:13:0
2 | exaple2.com | 6 | enabled | 2021-03-02 08:13:0
PHP code:
<div>
<label for="shortUrlDomain"><?php echo t("short_url_domain", "Short Url Domain"); ?>:</label>
<select id="shortUrlDomain" name="shortUrlDomain" style="width: 100%;">
<?php
foreach ($shortUrlDomains AS $k => $shortUrlDomain) {
// active domains only
if ($shortUrlDomain['status'] != 'enabled') {
continue;
}
$lastPremiumOnly = $shortUrlDomain['premium_only'];
echo '<option value="' . (int)$k . '"';
// selected option
if ($k == (int)$_REQUEST['shortUrlDomain']) {
echo ' SELECTED';
}
echo '>';
'</option>';
}
echo '</optgroup>';
?>
</select>
</div>
// get base urls
$shortUrlDomains = getShortUrlDomains();
static function getShortUrlDomain($domainId)
{
// get base urls
$shortUrlDomains = getShortUrlDomains();
if(!isset($shortUrlDomains[$domainId]))
{
return _CONFIG_SITE_PROTOCOL.'://'._CONFIG_SITE_FULL_URL;
}
return _CONFIG_SITE_PROTOCOL.'://'.$shortUrlDomains[$domainId]['domain'];
}

Answer 1

It's a bit hacky, but you might add this statement earlier in your code.
Ideally you'd alter the database query further down the stack, but you question doesn't include any mention of how you set $shortUrlDomains.
<?php
// somewhere before you render the HTML as in the snippet from your Q.
/**
* This makes shortUrlDomains into a subset of the original array,
* showing only those who have a `premium_only` key with a value of `6`.
*/
$shortUrlDomains = array_filter($shortUrlDomains, function($domain) {
return (int) $domain['premium_only'] === 6;
});
See more of array_filter here, at the PHP docs.