function variable_initialize

Loads the persistent variable table.

The variable table is composed of values that have been saved in the table with variable_set() as well as those explicitly specified in the configuration file.

File

core/includes/bootstrap.inc, line 1135

Functions that need to be loaded on every Backdrop request.

Code

function variable_initialize($conf = array()) {
  // watchdog_deprecated_function() is not called here even though this function
  // is deprecated because this function is *always* called during bootstrap.

  // NOTE: caching the variables improves performance by 20% when serving
  // cached pages.
  if ($cached = cache('bootstrap')->get('variables')) {
    $variables = $cached->data;
  }
  else {
    // Cache miss. Avoid a stampede.
    $name = 'variable_init';
    if (!lock_acquire($name, 1)) {
      // Another request is building the variable cache.
      // Wait, then re-run this function.
      lock_wait($name);
      return variable_initialize($conf);
    }
    else {
      // Proceed with variable rebuild.
      $variables = array_map('unserialize', db_query('SELECT name, value FROM {variable}')->fetchAllKeyed());
      cache('bootstrap')->set('variables', $variables);
      lock_release($name);
    }
  }

  foreach ($conf as $name => $value) {
    $variables[$name] = $value;
  }

  return $variables;
}