return an array of callable methods include inherited methods function

// return an array of callable methods (include inherited methods)
function get_methods($object) {
  $methods = get_class_methods(get_class($object));

  if(get_parent_class($object)) {
    $parent_methods = get_class_methods(get_parent_class($object));
    $methods = array_diff($methods, $parent_methods);
  }

  return $methods;
}

// return an array of inherited methods
function get_inherited_methods($object) {
  $methods = get_class_methods(get_class($object));

  if(get_parent_class($object)) {
    $parent_methods = get_class_methods(get_parent_class($object));
    $methods = array_intersect($methods, $parent_methods);
  }
  
  return $methods;
}

// return an array of superclasses
function get_lineage($object) {
  if(get_parent_class($object)) {
    $parent = get_parent_class($object);
    $parent_object = new $parent;
    
    $lineage = get_lineage($parent_object);
    $lineage[] = get_class($object);
  }
  else {
    $lineage = array(get_class($object));
  }

  return $lineage;
}

// return an array of subclasses
function get_child_classes($object) {
  $classes = get_declared_classes( );

  $children = array( );
  foreach($classes as $class) {
    if (substr($class, 0, 2) == '_  _') {
        continue;
    }
    $child = new $class;
    if(get_parent_class($child) == get_class($object)) {
      $children[] = $class;
    }
  }
  
  return $children;
}

// display information on an object
function print_object_info($object) {
  $class = get_class($object);
  echo '<h2>Class</h2>';
  echo "<p>$class</p>";

  echo '<h2>Inheritance</h2>';

  echo '<h3>Parents</h3>';
  $lineage = get_lineage($object);
  array_pop($lineage);
  echo count($lineage) ? ('<p>' . join(' -&gt; ', $lineage) . '</p>')
                       : '<i>None</i>';

  echo '<h3>Children</h3>';
  $children = get_child_classes($object);
  echo '<p>' . (count($children) ? join(', ', $children) 
                                 : '<i>None</i>') . '</p>';

  echo '<h2>Methods</h2>';
  $methods = get_class_methods($class);
  $object_methods = get_methods($object);
  if(!count($methods)) {
    echo "<i>None</i><br />";
  }
  else {
    echo '<p>Inherited methods are in <i>italics</i>.</p>';
    foreach($methods as $method) {
    echo in_array($method, $object_methods) ? "<b>$method</b>( );<br />"
                                            : "<i>$method</i>( );<br />";
    }
  }

  echo '<h2>Properties</h2>';
  $properties = get_class_vars($class);
  if(!count($properties)) {
    echo "<i>None</i><br />";
  }
  else {
    foreach(array_keys($properties) as $property) {
      echo "<b>\$$property</b> = " . $object->$property . '<br />';
    }
  }

  echo '<hr />';
}