<?php
error_reporting(E_ALL | E_STRICT);
define('ITERATIONS', 1000000);

define('DRUPAL_ROOT', getcwd());

require_once DRUPAL_ROOT . '/includes/bootstrap.inc';
drupal_bootstrap(DRUPAL_BOOTSTRAP_FULL);
$date = time();

function no_op($text) {
  return $text;
}

function format_date_new($timestamp, $type = 'medium', $format = '', $timezone = NULL, $langcode = NULL) {
  $cache = &$GLOBALS['drupal_static'];

  // Maintain a local cache of date variables to avoid repeated calls to
  // variable_get().
  if (!isset($cache['variables'])){
    $cache['variables'] = array(
      'small' => variable_get('date_format_short', 'm/d/Y - H:i'),
      'medium' => variable_get('date_format_medium', 'D, m/d/Y - H:i'),
      'large' => variable_get('date_format_long', 'l, F j, Y - H:i'),
      'configurable_timezones' => variable_get('configurable_timezones', 1),
      'date_default_timezone' => variable_get('date_default_timezone', 'UTC')
    );
  }

  if (!isset($timezone)) {
    global $user;
    if (variable_get('configurable_timezones', 1) && $user->uid && $user->timezone) {
      $timezone = $user->timezone;
    }
    else {
      $timezone = $cache['variables']['date_default_timezone'];
    }
  }
  // Store DateTimeZone objects in an array rather than repeatedly
  // contructing identical objects over the life of a request.
  if (!isset($cache['timezones'][$timezone])) {
    $cache['timezones'][$timezone] = timezone_open($timezone);
  }

  // Use the default langcode if none is set.
  if (empty($langcode)) {
    global $language;
    $langcode = isset($language->language) ? $language->language : 'en';
  }

  switch ($type) {
    case 'small':
      $format = $cache['variables']['small'];
      break;
case 'large':
      $format = $cache['variables']['large'];
      break;
    case 'custom':
      // No change to format.
      break;
    case 'medium':
    default:
      $format = $cache['variables']['medium'];
      break;
  }

  // Create a DateTime object from the timestamp.
  $date_time = date_create('@' . $timestamp);
  // Set the time zone for the DateTime object.
  date_timezone_set($date_time, $cache['timezones'][$timezone]);

  // Encode markers that should be translated. 'A' becomes '\xEF\AA\xFF'.
  // xEF and xFF are invalid UTF-8 sequences, and we assume they are not in the
  // input string.
  // Paired backslashes are isolated to prevent errors in read-ahead evaluation.
  // The read-ahead expression ensures that A matches, but not \A.
  $format = preg_replace(array('/\\\\\\\\/', '/(?<!\\\\)([AaeDlMTF])/'), array("\xEF\\\\\\\\\xFF", "\xEF\\\\\$1\$1\xFF"), $format);

  // Call date_format().
  $format = date_format($date_time, $format);

  // Pass the langcode to _format_date_callback().
  _format_date_callback(NULL, $langcode);

  // Translate the marked sequences.
  return preg_replace_callback('/\xEF([AaeDlMTF]?)(.*?)\xFF/', '_format_date_callback', $format);
}


$start = microtime(true);
for ($i=0; $i < ITERATIONS; ++$i) {
}
$stop = microtime(true);
echo "nothing: " . ($stop - $start) . " seconds". PHP_EOL;

$start = microtime(true);
for ($i=0; $i < ITERATIONS; ++$i) {
  $text = no_op($date);
}
$stop = microtime(true);
echo "function no_op(): " . ($stop - $start) . " seconds". PHP_EOL;


$start = microtime(true);
for ($i=0; $i < ITERATIONS; ++$i) {
  $text = format_date($date);
}
$stop = microtime(true);
echo "check plain old: " . ($stop - $start) . " seconds". PHP_EOL;

$start = microtime(true);
for ($i=0; $i < ITERATIONS; ++$i) {
$text = format_date_new($date);
}
$stop = microtime(true);
echo "check plain new: " . ($stop - $start) . " seconds". PHP_EOL;
?>