With composer, add:
$ composer require patrickdevelopment/cir
$builder = new \patrickDevelopment\cir\builder\SearchUndertaking();
$builder->setHouseNumber(99);
$builder->setPostalCode('2404HH');
$client = new \patrickDevelopment\cir\client\CirClient($builder);
$client->setAuthentication('username', 'password');
print_r($client->fetchResults());
$builder = new \patrickDevelopment\cir\builder\GetCaseWithReports();
$builder->setPublicationNumber('09.dha.20.118.F.1300.1.20');
$client = new \patrickDevelopment\cir\client\CirClient($builder);
$client->setAuthentication('username', 'password');
print_r($client->fetchResults());
$client = new \patrickDevelopment\cir\client\CirClient(new patrickDevelopment\cir\builder);
$client->fetchPdfDownload('09_dha_20_118_F_V_02');
CIR API has been created by Patrick Brouwer and is currently maintained by the developers at Patrick Development.