Add column to admin/content for Drupal 7

drupal_add_column_to_admincontent.php

<?
function MYMODULE_form_node_admin_content_alter(&$form, &$form_state, $form_id) {
    $column_alias = 'my_cool_column';
    $column_title = 'Header of my cool column';
    
    // Load the nodes. This incurrs very little overhead as 
    // "$nodes = node_load_multiple($nids);" has already been run on these
    // nids in node_admin_nodes(). The static cache will be used instead of
    // another db query being invoked
    $nodes = node_load_multiple(array_keys($form['admin']['nodes']['#options']));

    // Add another column to the table header
    $form['admin']['nodes']['#header'][$column_alias] = array('data' => t($column_title));
    
    // Loop through the rows in the table and add our cool column
    foreach ($form['admin']['nodes']['#options'] as $nid => $row) {
        // Add data for the new column
        $form['admin']['nodes']['#options'][$nid][$column_alias] = 'cool data'  
    }
}

real_example.php

<?
// колонка в админке
function bp_mixin_form_node_admin_content_alter(&$form, &$form_state, $form_id) {
  // Load the nodes. This incurrs very little overhead as 
  // "$nodes = node_load_multiple($nids);" has already been run on these
  // nids in node_admin_nodes(). The static cache will be used instead of
  // another db query being invoked
  $nodes = node_load_multiple(array_keys($form['admin']['nodes']['#options']));

  // Grab a list of all user ids that have been responsible for changing the node
  $cats = array();
  $cats_titles = array();
  $query = bp_getrootcats(null);
  foreach($query as $item)
    $cats_titles[$item->tid] = $item->name;

  // Add another column to the table header
  $form['admin']['nodes']['#header']['category'] = array('data' => 'Категория');
  $form['admin']['nodes']['#header']['series'] = array('data' => 'Серия');

  // Loop through the rows in the table and add the category column
  foreach ($form['admin']['nodes']['#options'] as $nid => $row) {
    // Add data for the new column
    $node = $nodes[$nid];
    $title = isset($node->field_catalog) ? $cats_titles[ $node->field_catalog[LANGUAGE_NONE][0]['tid'] ] : '';
    $form['admin']['nodes']['#options'][$nid]['category'] = $title;
    $form['admin']['nodes']['#options'][$nid]['series'] = isset($node->field_series) ? $node->field_series[LANGUAGE_NONE][0]['value'] : '';
  }
}