Demonstrating check for required fields with use of an array

check_fields_using_array.php

public function __construct($data) {
  $address = array('name', 'post_code');
  $business = array('name', 'address', 'post_code', 'intro');

  if ($data['type] == 'business') $fields = $business;
  else $fields = $address;

  if (count(array_intersect($fields, array_keys($data))) != count($fields)) {
    throw new Exception("Required data was not supplied to the Address object");
  }

  $keys = array_intersect($fields, array_keys($data));
  $data2 = array();
  foreach ($keys as $key) {
    $data2[$key] = $data[$key];
  }

  foreach ($data2 as $key=>$value) {
    $method = 'set' . ucfirst($key);
    $this->$method($value);
  }
}