hook_search

Definition

hook_search($op = 'search', $keys = null)
developer/hooks/core.php, line 1493

Description

Define a custom search routine.

This hook allows a module to perform searches on content it defines (custom node types, users, or comments, for example) when a site search is performed.

Note that you can use form API to extend the search. You will need to use hook_form_alter() to add any additional required form elements. You can process their values on submission using a custom validation function. You will need to merge any custom search values into the search keys using a key:value syntax. This allows all search queries to have a clean and permanent URL. See node_form_alter() for an example.

The example given here is for node.module, which uses the indexed search capabilities. To do this, node module also implements hook_update_index() which is used to create and maintain the index.

We call do_search() with the keys, the module name and extra SQL fragments to use when searching. See hook_update_index() for more information.

Parameters

$op A string defining which operation to perform:

'name': the hook should return a translated name defining the type of items that are searched for with this module ('content', 'users', ...)
'reset': the search index is going to be rebuilt. Modules which use hook_update_index() should update their indexing bookkeeping so that it starts from scratch the next time hook_update_index() is called.
'search': the hook should perform a search using the keywords in $keys
'status': if the module implements hook_update_index(), it should return an array containing the following keys:
- remaining: the amount of items that still need to be indexed
- total: the total amount of items (both indexed and unindexed)

$keys The search keywords as entered by the user.

Return value

An array of search results. Each item in the result set array may contain whatever information the module wishes to display as a search result. To use the default search result display, each item should be an array which can have the following keys:

link: the URL of the found item
type: the type of item
title: the name of the item
user: the author of the item
date: a timestamp when the item was last modified
extra: an array of optional extra information items
snippet: an excerpt or preview to show with the result (can be generated with search_excerpt())

Only 'link' and 'title' are required, but it is advised to fill in as many of these fields as possible.

Name	Description
Hooks	Allow modules to interact with the Drupal core.
Search interface	The Drupal search interface manages a global search mechanism.

Code

<?php
function hook_search($op = 'search', $keys = null) {
  switch ($op) {
    case 'name':
      return t('Content');

    case 'reset':
      db_query("UPDATE {search_dataset} SET reindex = %d WHERE type = 'node'", REQUEST_TIME);
      return;

    case 'status':
      $total = db_result(db_query('SELECT COUNT(*) FROM {node} WHERE status = 1'));
      $remaining = db_result(db_query("SELECT COUNT(*) FROM {node} n LEFT JOIN {search_dataset} d ON d.type = 'node' AND d.sid = n.nid WHERE n.status = 1 AND d.sid IS NULL OR d.reindex <> 0"));
      return array('remaining' => $remaining, 'total' => $total);

    case 'admin':
      $form = array();
      // Output form for defining rank factor weights.
      $form['content_ranking'] = array(
        '#type' => 'fieldset',
        '#title' => t('Content ranking'),
      );
      $form['content_ranking']['#theme'] = 'node_search_admin';
      $form['content_ranking']['info'] = array(
        '#value' => '<em>' . t('The following numbers control which properties the content search should favor when ordering the results. Higher numbers mean more influence, zero means the property is ignored. Changing these numbers does not require the search index to be rebuilt. Changes take effect immediately.') . '</em>'
      );

      // Note: reversed to reflect that higher number = higher ranking.
      $options = drupal_map_assoc(range(0, 10));
      foreach (module_invoke_all('ranking') as $var => $values) {
        $form['content_ranking']['factors']['node_rank_' . $var] = array(
          '#title' => $values['title'],
          '#type' => 'select',
          '#options' => $options,
          '#default_value' => variable_get('node_rank_' . $var, 0),
        );
      }
      return $form;

    case 'search':
      // Build matching conditions
      list($join1, $where1) = _db_rewrite_sql();
      $arguments1 = array();
      $conditions1 = 'n.status = 1';

      if ($type = search_query_extract($keys, 'type')) {
        $types = array();
        foreach (explode(',', $type) as $t) {
          $types[] = "n.type = '%s'";
          $arguments1[] = $t;
        }
        $conditions1 .= ' AND (' . implode(' OR ', $types) . ')';
        $keys = search_query_insert($keys, 'type');
      }

      if ($category = search_query_extract($keys, 'category')) {
        $categories = array();
        foreach (explode(',', $category) as $c) {
          $categories[] = "tn.tid = %d";
          $arguments1[] = $c;
        }
        $conditions1 .= ' AND (' . implode(' OR ', $categories) . ')';
        $join1 .= ' INNER JOIN {term_node} tn ON n.vid = tn.vid';
        $keys = search_query_insert($keys, 'category');
      }

      if ($languages = search_query_extract($keys, 'language')) {
        $categories = array();
        foreach (explode(',', $languages) as $l) {
          $categories[] = "n.language = '%s'";
          $arguments1[] = $l;
        }
        $conditions1 .= ' AND (' . implode(' OR ', $categories) . ')';
        $keys = search_query_insert($keys, 'language');
      }

      // Get the ranking expressions.
      $rankings = _node_rankings();

      // When all search factors are disabled (ie they have a weight of zero),
      // The default score is based only on keyword relevance.
      if ($rankings['total'] == 0) {
        $total = 1;
        $arguments2 = array();
        $join2 = '';
        $select2 = 'i.relevance AS score';
      }
      else {
        $total = $rankings['total'];
        $arguments2 = $rankings['arguments'];
        $join2 = implode(' ', $rankings['join']);
        $select2 = '(' . implode(' + ', $rankings['score']) . ') AS score';
      }

      // Do search.
      $find = do_search($keys, 'node', 'INNER JOIN {node} n ON n.nid = i.sid ' . $join1, $conditions1 . (empty($where1) ? '' : ' AND ' . $where1), $arguments1, $select2, $join2, $arguments2);

      // Load results.
      $results = array();
      foreach ($find as $item) {
        // Build the node body.
        $node = node_load($item->sid);
        $node->build_mode = NODE_BUILD_SEARCH_RESULT;
        $node = node_build_content($node, FALSE, FALSE);
        $node->body = drupal_render($node->content);

        // Fetch comments for snippet.
        $node->body .= module_invoke('comment', 'nodeapi', $node, 'update_index');
        // Fetch terms for snippet.
        $node->body .= module_invoke('taxonomy', 'nodeapi', $node, 'update_index');

        $extra = node_invoke_nodeapi($node, 'search_result');

        $results[] = array(
          'link' => url('node/' . $item->sid, array('absolute' => TRUE)),
          'type' => check_plain(node_get_types('name', $node)),
          'title' => $node->title,
          'user' => theme('username', $node),
          'date' => $node->changed,
          'node' => $node,
          'extra' => $extra,
          'score' => $total ? ($item->score / $total) : 0,
          'snippet' => search_excerpt($keys, $node->body),
        );
      }
      return $results;
  }
}
?>