<?php
function phptext_theme() {
  return array(
    'phptext_textarea' => array(
      'arguments' => array('element' => NULL),
    ),
    'phptext_formatter_default' => array(
      'arguments' => array('element' => NULL),
    ),
  );
}

function phptext_field_info() {
  return array(
    'phptext' => array(
      'label' => t('Dynamic Field'),
      'description' => t('Computes user generated php and lets you to access Drupal objects'),
      'callbacks' => array(
        'tables' => CONTENT_CALLBACK_DEFAULT,
        'arguments' => CONTENT_CALLBACK_DEFAULT,
        ),
      ),
    );
}


function phptext_field_settings($op, $field) {
  switch ($op) {
    case 'form':
		return array();
		
    case 'save':
      return array();

    case 'database columns':
		$columns['value'] = array('type' => 'text', 'size' => 'big', 'not null' => FALSE, 'sortable' => TRUE);
		return $columns;
  }
}


function phptext_field($op, &$node, $field, &$items, $teaser, $page) {
  switch ($op) {
    case 'sanitize':
      foreach ($items as $delta => $item) {
        $text=eval($field['widget']['code']);
        $items[$delta]['safe'] = $text;
      }
  }
}


function phptext_content_is_empty($item, $field) {
  return (empty($item['value']) && $item['value'] == '') ? TRUE : FALSE;
}


function phptext_field_formatter_info() {
  return array(
	  'default' => array(
      'label' => t('Default'),
      'field types' => array('phptext'),
      'multiple values' => CONTENT_HANDLE_CORE,
    ),
  );
}

function theme_phptext_formatter_default($element) {
  return $element['#item']['safe'];
}


function phptext_widget_info() {
  return array(
    'phptext_textarea' => array(
      'label' => t('Text area (multiple rows)'),
      'field types' => array('phptext'),
      'multiple values' => CONTENT_HANDLE_CORE,
      'callbacks' => array(
        'default value' => CONTENT_CALLBACK_DEFAULT,
      ),
    ),
  );
}


function phptext_elements() {
  return array(
    'phptext_textarea' => array(
      '#input' => TRUE,
      '#columns' => array('value', 'format'), '#delta' => 0,
      '#process' => array('phptext_textarea_process'),
      '#filter_value' => FILTER_FORMAT_DEFAULT,
      ),
  );
}


function phptext_widget_settings($op, $widget) {
 switch ($op) {
    case 'form':
      $form = array();
        $form['code'] = array(
          '#type' => 'textarea',
          '#title' => t('PHP code'),
          '#default_value' => isset($widget['code']) ? $widget['code'] : '' ,
          '#required' => TRUE,
        );
      return $form;

    case 'save':
	if (arg(3) && arg(5) && arg(4)=='fields') {phptext_update_existing_nodes(arg(3), arg(5));}
      return array('code');
  }
}


function phptext_widget(&$form, &$form_state, $field, $items, $delta = 0) {
  $element = array(
    '#type' => $field['widget']['type'],
    '#default_value' => isset($items[$delta]) ? $items[$delta] : '',
  );
  return $element;
}


function phptext_textarea_process($element, $edit, $form_state, $form) {
  return $element;
}


function theme_phptext_textarea($element) {
  return $element['#children'];
}

function phptext_update_existing_nodes($type, $field) {
$i=0;
$sql = "SELECT nid FROM node WHERE type='".$type."'";
  $result = mysql_query ($sql);
  if ($result) {
    if (mysql_num_rows($result)) {
      while ($row = mysql_fetch_row($result)) {
        $node=node_load($row[0]);
        $mod=$node->changed;
        $node->$field = array(array('value' => ''));
        node_save($node);
		db_query('UPDATE node SET changed=%d WHERE nid=%d', $mod, $row[0]);
	    $i++;	
     }
   }
  }
drupal_set_message(t('%nodes updated.', array(
'%nodes' => format_plural($i, '1 node has been', '@count nodes have been'))));
return;
}