<?php
    include 'apiClass.php';

    function HeroID($id, $array) {
        foreach ($array as $key => $val) {
            if ($val['hero_id'] === $id) {
                return $key;
            }
        }
        return null;
    }

    $HeroList = HeroList();
    $id = HeroID('2', $HeroList);

    echo "<pre>";
        echo $HeroList[$id][disp_name];
    echo "</pre>";

?>