composer require olivierbarbier/zuora-soap-apirequire 'vendor/autoload.php';
use Zuora\Soap\Api;
$api = Api::getInstance((object) ['wsdl' => 'path_to_your_zuora_wsdl']);
try {
$api->login('your_login', 'your_password');
$query = $api->query('SELECT Id, Name FROM Account');
var_dump($query);
} catch(\Exception $e) {
echo '>',$e->getMessage();
die;
}If you want more examples please have a look at Zuora PHP Quickstart
An other approach to work with Zuora Soapi API is explained here