Warning: count(): Parameter must be an array or an object that implements Countable

Hi everyone,

Since I update my PHP version to 7.2, I'm having warnings on class mpgCustInfo (mpgClasses.php) 

"Warning: count(): Parameter must be an array or an object that implements Countable in"

function toXML_low($template, $txnType)
{

   for ($x = 0; $x < count($this->level3data[$txnType]); $x++) {
      if ($x > 0) {
         $xmlString .= "</$txnType><$txnType>";
      }
      $keys = array_keys($template);
      for ($i = 0; $i < count($keys); $i++) {
         $tag = $keys[$i];

         if (is_array($template[$keys[$i]])) {
            $data = $template[$tag];

            if (! count($this->level3data[$tag])) {
               continue;
            }
            $beginTag = "<$tag>";
            $endTag = "</$tag>";

            $xmlString .= $beginTag;
            if (is_array($data)) {
               $returnString = $this->toXML_low($data, $tag);
               $xmlString .= $returnString;
            }
            $xmlString .= $endTag;
         } else {
            $tag = $template[$keys[$i]];
            $beginTag = "<$tag>";
            $endTag = "</$tag>";
            $data = $this->level3data[$txnType][$x][$tag];

            $xmlString .= $beginTag . $data . $endTag;
         }

      }//end inner for

   }//end outer for

   return $xmlString;
}//end toXML_low

Anyone having same issues?