function dmemcache_serialize_extension in Memcache API and Integration 7

Determine which serialize extension to use: serialize (none), igbinary, or msgpack.

By default we prefer the igbinary extension, then the msgpack extension, then the core serialize functions. This can be overridden in settings.php.

3 calls to dmemcache_serialize_extension()

dmemcache_serialize in ./dmemcache.inc

Return proper serialize function.

dmemcache_unserialize in ./dmemcache.inc

Return proper unserialize function.

memcache_admin_stats in memcache_admin/memcache_admin.module

Callback for the Memcache Stats page.

File

./dmemcache.inc, line 733

A memcache API for Drupal.

Code

function dmemcache_serialize_extension() {
  static $extension = NULL;
  if ($extension === NULL) {
    $preferred = strtolower(variable_get('memcache_serialize', NULL));

    // Fastpath if we're forcing php's own serialize function.
    if ($preferred == 'serialize') {
      $extension = $preferred;
    }
    else {
      $igbinary_available = extension_loaded('igbinary');
      $msgpack_available = extension_loaded('msgpack');
      if ($preferred == 'igbinary' && $igbinary_available) {
        $extension = $preferred;
      }
      elseif ($preferred == 'msgpack' && $msgpack_available) {
        $extension = $preferred;
      }
      else {

        // No (valid) serialize extension specified, try igbinary.
        if ($igbinary_available) {
          $extension = 'igbinary';
        }
        else {
          if ($msgpack_available) {
            $extension = 'msgpack';
          }
          else {
            $extension = 'serialize';
          }
        }
      }
    }
  }
  return $extension;
}