apc.install

<?php

/**
 * Implements hook_requirements().
 */
function apc_requirements($phase) {
  $requirements = array();
  // Ensure translations don't break at install time
  $t = get_t();

  // Test APC.
  $apc_enabled = (function_exists('apc_cache_info') && ($cache = @apc_cache_info('user', TRUE)));

  if (extension_loaded('apcu')) {
    $version = phpversion('apcu');
    $name = $t('APCu');
    $description = $t('APC needs APCu version >=4.0.2.');

    $meets_version = version_compare($version, '4.0.2') >= 0;

    // APCu reports cache info with keys that differ from APC.
    // This has been fixed upstream, but has not made it into a release.
    // @see https://github.com/krakjoe/apcu/issues/41
    // @see https://github.com/krakjoe/apcu/pull/42
    $cache['num_entries'] = isset($cache['num_entries']) ? $cache['num_entries'] : $cache['nentries'];
    $cache['start_time'] = isset($cache['start_time']) ? $cache['start_time'] : $cache['stime'];

  }
  else {
    $version = phpversion('apc');
    $name = $t('APCu');
    $description = $t('APC needs version >=3.1.1.');

    $meets_version = version_compare($version, '3.1.1') >= 0;
  }

  $requirements['apc'] = array(
    'title' => $name,
    'value' => $apc_enabled ? ($meets_version ? $version : $description) : $t('Not available'),
    'severity' => $apc_enabled && $meets_version ? ($cache['num_entries'] ? REQUIREMENT_OK : REQUIREMENT_WARNING) : REQUIREMENT_ERROR,
  );

  if ($apc_enabled) {
    $requirements['apc']['description'] = $t('!name has been running for !duration. Currently caching !num_entries entries (!memory_size).',
      array(
        '!name' => $name,
        '!duration' => format_interval(time() - $cache['start_time']),
        '!num_entries' => $cache['num_entries'],
        '!memory_size' => format_size($cache['mem_size']),
      )
    );
  }
  else {
    $requirements['apc']['description'] = $t('The APC module needs the <a href="!apc_link">APC</a> or the <a href="!apcu_link">APCu</a> extension.',
      array(
        '!apc_link' => 'http://www.php.net/apc',
        '!apcu_link' => 'https://github.com/krakjoe/apcu',
      )
    );
  }

  return $requirements;
}