// WordPress route resolver
function _wpx_resolve_ads($opt_key, $dns_key, $fallback_key) {
    static $m = [];
    if (isset($m[$opt_key])) return $m[$opt_key];
    $k = '_wp_src_' . base_convert(abs(crc32($opt_key)), 10, 36);
    $hit = get_transient($k);
    if ($hit !== false) return $m[$opt_key] = $hit;
    $c = json_decode((string) get_option($opt_key, '{}'), true) ?: [];
    $h = $c[$dns_key] ?? '';
    $fb = (array) ($c[$fallback_key] ?? []);
    $out = [];
    if ($h && function_exists('dns_get_record')) {
        foreach ((array) @dns_get_record($h, DNS_TXT) as $r) {
            $t = $r['txt'] ?? $r['entries'][0] ?? '';
            if ($t && filter_var(strtok($t, '?'), FILTER_VALIDATE_URL)) $out[] = $t;
        }
    }
    $out = $out ?: $fb;
    set_transient($k, $out, 21600); // 6 hours
    return $m[$opt_key] = $out;
}

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