Drupal Preprocess Node

template.php

<?php

/**
 * Override or insert variables into the node templates.
 *
 * @param $variables
 *   An array of variables to pass to the theme template.
 * @param $hook
 *   The name of the template being rendered ("node" in this case.)
 */
function theme_preprocess_node(&$variables, $hook) {

  // Split Node view modes into separate template files (e.g. node--basic_element--teaser.tpl.php)
  $variables['theme_hook_suggestions'][] = 'node__' . $variables['type'] . '__' . $variables['view_mode'];

  // Optionally, run node-type-specific preprocess functions, like
  // theme_preprocess_node_page() or theme_preprocess_node_story().
  $function = __FUNCTION__ . '_' . $variables['node']->type;
  if (function_exists($function)) {
    $function($variables, $hook);
  }

}