CEP - Google Maps Api

<?php

function getCoordenadasCep($cep, $precisao_minima = 1, $precisao = 8) {
    if($cep == '00000000')
        return null;

    $service_url = 'http://maps.googleapis.com/maps/api/geocode/json?address=%s&sensor=false&components=country:BR';

    $referencia = $cep;

    for ($idx = 7; $idx >= $precisao; $idx--) {
        $referencia[$idx] = 0;
    }

    $result = DB::q('SELECT * FROM default_ceps c WHERE c.cep = ?s AND c.precisao > 0', $referencia)->fetch(PDO::FETCH_ASSOC);

    if($result) {
        return $result;
    }

    $masked   = preg_replace('/(\d{5})(\d{3})/', "$1-$2", $referencia);
    $url      = sprintf($service_url, $masked);
    $response = file_get_contents($url);
    $data     = json_decode($response, true);
    $types    = isset($data['results'][0]['address_components'][0]['types']) ? (array)$data['results'][0]['address_components'][0]['types'] : array();

    if(!in_array('postal_code', $types) && !in_array('postal_code_prefix', $types)) {
        $data = null;

        if($precisao > $precisao_minima) {
            sleep(1);
            $data = getCoordenadasCep($cep, $precisao_minima, $precisao - 1);

            if($data) {
                DB::x('REPLACE INTO default_ceps(cep, latitude, longitude, precisao, referencia) VALUES(?s, ?f, ?f, ?i, ?s)',
                      $referencia, $data['latitude'], $data['longitude'], $data['precisao'], $data['referencia']);
            }
        }

        return $data;
    }

    if(!isset($data['results'][0]['geometry']['location'])) {
        return null;
    }

    $location = $data['results'][0]['geometry']['location'];

    DB::x('REPLACE INTO default_ceps(cep, latitude, longitude, precisao, referencia) VALUES(?s, ?f, ?f, ?i, ?s)',
          $referencia, $location['lat'], $location['lng'], 8, $referencia);

    return array(
            'cep'       => $cep,
            'latitude'  => $location['lat'],
            'longitude' => $location['lng'],
            'precisao'  => $precisao,
            'referencia'=> $referencia
        );
}