function drupal_page_set_cache

Stores the current page in the cache.

If page_compression is enabled, a gzipped version of the page is stored in the cache to avoid compressing the output on each request. The cache entry is unzipped in the relatively rare event that the page is requested by a client without gzip support.

Page compression requires the PHP zlib extension (http://php.net/manual/ref.zlib.php).

See also

drupal_page_header()

File

includes/common.inc, line 5461

Code

function drupal_page_set_cache() {
    global $base_root;
    if (drupal_page_is_cacheable()) {
        // Check whether the current page might be compressed.
        $page_compressed = variable_get('page_compression', TRUE) && extension_loaded('zlib');
        $cache = (object) array(
            'cid' => $base_root . request_uri(),
            'data' => array(
                'path' => $_GET['q'],
                'body' => ob_get_clean(),
                'title' => drupal_get_title(),
                'headers' => array(),
                // We need to store whether page was compressed or not,
                // because by the time it is read, the configuration might change.
'page_compressed' => $page_compressed,
            ),
            'expire' => CACHE_TEMPORARY,
            'created' => REQUEST_TIME,
        );
        // Restore preferred header names based on the lower-case names returned
        // by drupal_get_http_header().
        $header_names = _drupal_set_preferred_header_name();
        foreach (drupal_get_http_header() as $name_lower => $value) {
            $cache->data['headers'][$header_names[$name_lower]] = $value;
            if ($name_lower == 'expires') {
                // Use the actual timestamp from an Expires header if available.
                $cache->expire = strtotime($value);
            }
        }
        if ($cache->data['body']) {
            if ($page_compressed) {
                $cache->data['body'] = gzencode($cache->data['body'], 9, FORCE_GZIP);
            }
            cache_set($cache->cid, $cache->data, 'cache_page', $cache->expire);
        }
        return $cache;
    }
}