CREATE TABLE IF NOT EXISTS `ip_whois` (
  `whois_id` int(11) NOT NULL AUTO_INCREMENT,
  `whois_ip` varchar(16) COLLATE utf8_unicode_ci NOT NULL,
  `whois_data` text COLLATE utf8_unicode_ci NOT NULL,
  PRIMARY KEY (`whois_id`),
  KEY `whois_ip` (`whois_ip`)
) ENGINE=MyISAM  DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

First we need to create a very simple table to store our returned data. We don't REALLY want to repeat things. If using the free tier that misstep could push your needs into a paid subscription.

<?php
// Here you would use your project's MySQL processor to perform this part.
$db = Factory::load("DB");
$db->my_addParam("ip",$ip);
$query = "SELECT * FROM ip_whois WHERE whois_ip='{ip}'";
$wq = $db->my_Query($query);
if($db->my_Rows($wq)>0) {
	$wqa = $db->my_Fetch($wq);
	$isbad = $wqa['whois_data'];
} else {
	/* This is the important part really */
	$ch = curl_init();
	curl_setopt_array($ch, [
		CURLOPT_URL => "http://v2.api.iphub.info/ip/".$_SERVER['REMOTE_ADDR'],
		CURLOPT_RETURNTRANSFER => true,
		CURLOPT_HTTPHEADER => ["X-Key: your_api_key_here"] // Change this
	]);
	$isbad =  json_decode(curl_exec($ch))->block;
	/* end */
	// Here you would use your project's MySQL processor to perform this part.
	$db->my_addParam("ip",$_SERVER['REMOTE_ADDR']);
	$db->my_addParam("wdata",$isbad);
	$query = "INSERT INTO ip_whois (whois_ip,whois_data) VALUES ('{ip}','{wdata}')";
	$iw = $db->my_Query($query);
	if($isbad == 1) {
		/* Do something */
	}
}
?>

Now we process the IP address into our database if it's not in there. This example is more like a skeleton. It won't work out of the box cuz you'd need the MySQL processor with it but I outlined the important part and left the rest as a sort of example of how you COULD fit it into your existing project and how it SHOULD be handled as to not overload the IPHub.Info allowance you're given. The '$isbad' variable in the example will return greater than 0 if the IP address is in the blocklist database. However, if the return code is '2' then you might have a false positive so we're only catching IP's that has a return value of '1'.