$json = '{"firstName":"ban", "lastName":"shan","age":1,"data":{"hobby":"coding"} }';
$validator = new JsonSchema\Validator;
$schema = file_get_contents("schema.json");
$validator->check(json_decode($json), json_decode($schema));
if ($validator->isValid()) {
  echo "The supplied JSON validates against the schema.\n";
} else {
  echo "JSON does not validate. Violations:\n";
  foreach ($validator->getErrors() as $error) {
    echo sprintf("[%s] %s\n", $error['property'], $error['message']);
  }
}