function system_performance_settings

Form builder; Configure site performance settings.

See also

system_settings_form()

Related topics

File

modules/system/system.admin.inc, line 1703

Code

function system_performance_settings() {
    drupal_add_js(drupal_get_path('module', 'system') . '/system.js');
    $form['clear_cache'] = array(
        '#type' => 'fieldset',
        '#title' => t('Clear cache'),
    );
    $form['clear_cache']['clear'] = array(
        '#type' => 'submit',
        '#value' => t('Clear all caches'),
        '#submit' => array(
            'system_clear_cache_submit',
        ),
    );
    $form['caching'] = array(
        '#type' => 'fieldset',
        '#title' => t('Caching'),
    );
    $cache = variable_get('cache', 0);
    $form['caching']['cache'] = array(
        '#type' => 'checkbox',
        '#title' => t('Cache pages for anonymous users'),
        '#default_value' => $cache,
        '#weight' => -2,
    );
    $period = drupal_map_assoc(array(
        0,
        60,
        180,
        300,
        600,
        900,
        1800,
        2700,
        3600,
        10800,
        21600,
        32400,
        43200,
        86400,
    ), 'format_interval');
    $period[0] = '<' . t('none') . '>';
    $form['caching']['cache_lifetime'] = array(
        '#type' => 'select',
        '#title' => t('Minimum cache lifetime'),
        '#default_value' => variable_get('cache_lifetime', 0),
        '#options' => $period,
        '#description' => t('Cached pages will not be re-created until at least this much time has elapsed.'),
    );
    $form['caching']['page_cache_maximum_age'] = array(
        '#type' => 'select',
        '#title' => t('Expiration of cached pages'),
        '#default_value' => variable_get('page_cache_maximum_age', 0),
        '#options' => $period,
        '#description' => t('The maximum time an external cache can use an old version of a page.'),
    );
    $directory = 'public://';
    $is_writable = is_dir($directory) && is_writable($directory);
    $disabled = !$is_writable;
    $disabled_message = '';
    if (!$is_writable) {
        $disabled_message = ' ' . t('<strong class="error">Set up the <a href="!file-system">public files directory</a> to make these optimizations available.</strong>', array(
            '!file-system' => url('admin/config/media/file-system'),
        ));
    }
    $form['bandwidth_optimization'] = array(
        '#type' => 'fieldset',
        '#title' => t('Bandwidth optimization'),
        '#description' => t('External resources can be optimized automatically, which can reduce both the size and number of requests made to your website.') . $disabled_message,
    );
    $js_hide = $cache ? '' : ' class="js-hide"';
    $form['bandwidth_optimization']['page_compression'] = array(
        '#type' => 'checkbox',
        '#title' => t('Compress cached pages.'),
        '#default_value' => variable_get('page_compression', TRUE),
        '#prefix' => '<div id="page-compression-wrapper"' . $js_hide . '>',
        '#suffix' => '</div>',
    );
    $form['bandwidth_optimization']['preprocess_css'] = array(
        '#type' => 'checkbox',
        '#title' => t('Aggregate and compress CSS files.'),
        '#default_value' => intval(variable_get('preprocess_css', 0) && $is_writable),
        '#disabled' => $disabled,
    );
    $form['bandwidth_optimization']['preprocess_js'] = array(
        '#type' => 'checkbox',
        '#title' => t('Aggregate JavaScript files.'),
        '#default_value' => intval(variable_get('preprocess_js', 0) && $is_writable),
        '#disabled' => $disabled,
    );
    $form['#submit'][] = 'drupal_clear_css_cache';
    $form['#submit'][] = 'drupal_clear_js_cache';
    // This form allows page compression settings to be changed, which can
    // invalidate the page cache, so it needs to be cleared on form submit.
    $form['#submit'][] = 'system_clear_page_cache_submit';
    return system_settings_form($form);
}