/Drupal 8

function template_preprocess

template_preprocess(&$variables, $hook, $info)

Adds a default set of helper variables for preprocessors and templates.

This function is called for theme hooks implemented as templates only, not for theme hooks implemented as functions. This preprocess function is the first in the sequence of preprocessing functions that are called when preparing variables for a template.

See the Default theme implementations topic for details.


core/includes/theme.inc, line 1196
The theme system, which controls the output of Drupal.


function template_preprocess(&$variables, $hook, $info) {
  // Merge in variables that don't depend on hook and don't change during a
  // single page request.
  // Use the advanced drupal_static() pattern, since this is called very often.
  static $drupal_static_fast;
  if (!isset($drupal_static_fast)) {
    $drupal_static_fast['default_variables'] = &drupal_static(__FUNCTION__);
  $default_variables = &$drupal_static_fast['default_variables'];
  if (!isset($default_variables)) {
    $default_variables = _template_preprocess_default_variables();
  $variables += $default_variables;

  // When theming a render element, merge its #attributes into
  // $variables['attributes'].
  if (isset($info['render element'])) {
    $key = $info['render element'];
    if (isset($variables[$key]['#attributes'])) {
      $variables['attributes'] = NestedArray::mergeDeep($variables['attributes'], $variables[$key]['#attributes']);

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