defensive programming

Dfence.php

<?php

    if (empty($json_object->fields) && empty($json_object->field_deltas)) {
      echo "Embedded Reference -- fields NO, field_deltas NO.\n";
      print_r($json_object);
      die();
    }
    else if (!empty($json_object->fields) && empty($json_object->field_deltas)) {
      echo "Embedded Reference -- fields YES, field_deltas NO.\n";
    }
    else if (empty($jsob_object->fields) && !empty($json_object->field_deltas)) {
      echo "Embedded Reference -- fields YES, field_deltas NO.\n";
    }
    else if (!empty($json_object->fields) && !empty($json_object->field_deltas)) {
      echo "Embedded Reference -- fields YES, field_deltas YES -- BOTH.\n";
    }
    else {
      echo "Embedded Reference fields vs field_deltas, final else: this block should never be reached.\n";
      print_r($json_object);
      die();
    }