Useful hooks and functions in Drupal 7

Source code viewer
// Includes another module file, so you can use functions that are in that file.
module_load_include($type, $module, $name = NULL);
 
// Use same window as dpm called krumo, to show arrays in message log.
watchdog('debug', kprint_r($var, TRUE, NULL));
 
// Hook form alter just for reference, I really need this a lot.
/**
 * Implements hook_form_alter().
 */
function HOOK_form_alter(&$form, &$form_state, $form_id) {
 
}
 
// Use instead of hook_init: browse-tutorials.com/snippet/use-hookpagebuild-instead-hookinit-add-css-or-js-every-page
/**
 * Implements hook_page_build().
 */
function hook_page_build(&$page) {
 
}
 
// More views hooks: api.drupal.org/api/views/views.api.php/group/views_hooks/7
/**
 * Implements hook_views_query_alter().
 */
function HOOK_views_query_alter(&$view, &$query) {
 
}
 
// Returns snippets from a piece of text, with certain keywords highlighted. Used for formatting search results.
search_excerpt($keys, $text)
 
// Performs HTTP requests. This is a flexible and powerful HTTP client implementation. Correctly handles GET, POST, PUT or any other HTTP requests.
drupal_http_request($url, array $options = array())
 
// Static cache.
function foo() {
  $cache = &drupal_static(__FUNCTION__);
  if (!isset($cache)) {
    // ...
  }
  return $cache;
}
 
// "Permanent" cache.
function foo() {
  $cache = &drupal_static(__FUNCTION__);
  if (!isset($cache)) {
    if ($cache = cache_get(__FUNCTION__ . '_data')) {
      $cache = $cache->data;
    }
    else {
      // ...
      cache_set(__FUNCTION__ . '_data', $cache, 'cache');
    }
  }
  return $cache;
}
Programming Language: PHP