/**
* @param $buffer
* @param $has_dynamic
* @return array
*/
private function _can_cache_buffer(&$buffer, $has_dynamic)
{
$mobile_group = $this->_get_mobile_group();
$referrer_group = $this->_get_referrer_group();
$encryption = $this->_get_encryption();
$compression = $this->_get_compression();
$compressions = $this->_get_compressions();
/**
* Don't use compression for debug mode or dynamic tags
* because we need to modify buffer before send it to client
*/
$raw = $this->_debug || $has_dynamic;
if ($raw) {
$compression = false;
$compressions = array(false);
}
$content_type = '';
$is_404 = function_exists('is_404') ? is_404() : false;
$headers = $this->_get_cached_headers();
if ($this->_enhanced_mode && !$this->_late_init) {
$this->_check_rules_present();
if (isset($headers['Content-Type'])) {
$content_type = $headers['Content-Type'];
}
}
$time = time();
$cache = $this->_get_cache();
/**
* Store different versions of cache
*/
$buffers = array();
$group = '0';
if (!isset($this->_sitemap_matched)) {
$sitemap_regex = $this->_config->get_string('pgcache.purge.sitemap_regex');
if ($sitemap_regex && preg_match('/' . $sitemap_regex . '/', basename($this->_request_uri))) {
$group = 'sitemaps';
$this->_sitemap_matched = true;
}
} elseif ($this->_sitemap_matched) {
$group = 'sitemaps';
}
foreach ($compressions as $_compression) {
$_page_key = $this->_get_page_key($mobile_group, $referrer_group, $encryption, $_compression, $content_type);
/**
* Compress content
*/
$buffers[$_compression] = $buffer;
$this->_compress($buffers[$_compression], $_compression);
/**
* Store cache data
*/
$_data = array('404' => $is_404, 'headers' => $headers, 'time' => $time, 'content' => &$buffers[$_compression]);
$cache->set($_page_key, $_data, $this->_lifetime, $group);
}
/**
* Change buffer if using compression
*/
if ($compression && isset($buffers[$compression])) {
$buffer =& $buffers[$compression];
}
/**
* Calculate content etag
*/
$etag = md5($buffer);
/**
* Send headers
*/
$this->_send_headers($is_404, $time, $etag, $compression, $headers);
if ($raw) {
if ($this->_debug && w3_can_print_comment($buffer)) {
$buffer = $this->_debugging_caching($buffer, $mobile_group, $referrer_group, $encryption, $compression, $content_type);
}
/**
* Don't use shutdown function below
*/
if (!$has_dynamic) {
$this->_compress($buffer, $compression);
return array($compression, $buffer);
}
return array($compression, $buffer);
}
return array($compression, $buffer);
}
/**
* Output buffering callback
*
* @param string $buffer
* @return string
*/
function ob_callback($buffer)
{
global $wpdb;
if ($buffer != '') {
if (w3_is_database_error($buffer)) {
status_header(503);
} else {
if (w3_can_print_comment($buffer)) {
/**
* Add footer comment
*/
$date = date_i18n('Y-m-d H:i:s');
$host = !empty($_SERVER['SERVER_NAME']) ? $_SERVER['SERVER_NAME'] : 'localhost';
if (w3_is_preview_mode()) {
$buffer .= "\r\n<!-- W3 Total Cache used in preview mode -->";
}
if ($this->_config->get_string('common.support') != '' || $this->_config->get_boolean('common.tweeted')) {
$buffer .= sprintf("\r\n<!-- Served from: %s @ %s by W3 Total Cache -->", w3_escape_comment($host), $date);
} else {
$strings = array();
if ($this->_config->get_boolean('minify.enabled') && !$this->_config->get_boolean('minify.debug')) {
$w3_plugin_minify = w3_instance('W3_Plugin_Minify');
$strings[] = sprintf(__('Minified using %s%s', 'w3-total-cache'), w3_get_engine_name($this->_config->get_string('minify.engine')), $w3_plugin_minify->minify_reject_reason != '' ? sprintf(' (%s)', $w3_plugin_minify->minify_reject_reason) : '');
}
if ($this->_config->get_boolean('pgcache.enabled') && !$this->_config->get_boolean('pgcache.debug')) {
$w3_pgcache = w3_instance('W3_PgCache');
$strings[] = sprintf(__('Page Caching using %s%s', 'w3-total-cache'), w3_get_engine_name($this->_config->get_string('pgcache.engine')), $w3_pgcache->cache_reject_reason != '' ? sprintf(' (%s)', $w3_pgcache->cache_reject_reason) : '');
}
if ($this->_config->get_boolean('dbcache.enabled') && !$this->_config->get_boolean('dbcache.debug')) {
/**
* @var W3_DbCache $db
*/
$db = w3_instance('W3_DbCache');
$append = ($reason = $db->get_reject_reason()) ? sprintf(' (%s)', $reason) : '';
if ($db->query_hits) {
$strings[] = sprintf(__('Database Caching %d/%d queries in %.3f seconds using %s%s', 'w3-total-cache'), $db->query_hits, $db->query_total, $db->time_total, w3_get_engine_name($this->_config->get_string('dbcache.engine')), $append);
} else {
$strings[] = sprintf(__('Database Caching using %s%s', 'w3-total-cache'), w3_get_engine_name($this->_config->get_string('dbcache.engine')), $append);
}
}
if (w3_is_dbcluster()) {
$db_cluster = w3_instance('W3_Enterprise_DbCluster');
$strings[] = $db_cluster->status_message();
}
if ($this->_config->get_boolean('objectcache.enabled') && !$this->_config->get_boolean('objectcache.debug')) {
/**
* @var W3_ObjectCache $w3_objectcache
*/
$w3_objectcache = w3_instance('W3_ObjectCache');
$append = ($reason = $w3_objectcache->get_reject_reason()) ? sprintf(' (%s)', $reason) : '';
$strings[] = sprintf(__('Object Caching %d/%d objects using %s%s', 'w3-total-cache'), $w3_objectcache->cache_hits, $w3_objectcache->cache_total, w3_get_engine_name($this->_config->get_string('objectcache.engine')), $append);
}
if (w3_is_pro($this->_config) || w3_is_enterprise($this->_config)) {
if ($this->_config->get_boolean('fragmentcache.enabled') && !$this->_config->get_boolean('fragmentcache.debug')) {
$w3_fragmentcache = w3_instance('W3_Pro_FragmentCache');
$append = $w3_fragmentcache->cache_reject_reason != '' ? sprintf(' (%s)', $w3_fragmentcache->cache_reject_reason) : '';
$strings[] = sprintf(__('Fragment Caching %d/%d fragments using %s%s', 'w3-total-cache'), $w3_fragmentcache->cache_hits, $w3_fragmentcache->cache_total, w3_get_engine_name($this->_config->get_string('fragmentcache.engine')), $append);
}
}
if ($this->_config->get_boolean('cdn.enabled') && !$this->_config->get_boolean('cdn.debug')) {
$w3_plugin_cdn = w3_instance('W3_Plugin_Cdn');
$w3_plugin_cdncommon = w3_instance('W3_Plugin_CdnCommon');
$cdn = $w3_plugin_cdncommon->get_cdn();
$via = $cdn->get_via();
$strings[] = sprintf(__('Content Delivery Network via %s%s', 'w3-total-cache'), $via ? $via : 'N/A', $w3_plugin_cdn->cdn_reject_reason != '' ? sprintf(' (%s)', $w3_plugin_cdn->cdn_reject_reason) : '');
}
if ($this->_config->get_boolean('newrelic.enabled')) {
$w3_newrelic = w3_instance('W3_Plugin_NewRelic');
$append = $w3_newrelic->newrelic_reject_reason != '' ? sprintf(' (%s)', $w3_newrelic->newrelic_reject_reason) : '';
$strings[] = sprintf(__("Application Monitoring using New Relic%s", 'w3-total-cache'), $append);
}
$buffer .= "\r\n<!-- Performance optimized by W3 Total Cache. Learn more: http://www.w3-edge.com/wordpress-plugins/\r\n";
if (count($strings)) {
$buffer .= "\r\n" . implode("\r\n", $strings) . "\r\n";
}
$buffer .= sprintf("\r\n Served from: %s @ %s by W3 Total Cache -->", w3_escape_comment($host), $date);
}
if ($this->is_debugging()) {
if ($this->_config->get_boolean('dbcache.enabled') && $this->_config->get_boolean('dbcache.debug')) {
$db = w3_instance('W3_DbCache');
$buffer .= "\r\n\r\n" . $db->_get_debug_info();
}
if ($this->_config->get_boolean('objectcache.enabled') && $this->_config->get_boolean('objectcache.debug')) {
$w3_objectcache = w3_instance('W3_ObjectCache');
$buffer .= "\r\n\r\n" . $w3_objectcache->_get_debug_info();
}
if (w3_is_pro($this->_config) || w3_is_enterprise($this->_config)) {
if ($this->_config->get_boolean('fragmentcache.enabled') && $this->_config->get_boolean('fragmentcache.debug')) {
$w3_fragmentcache = w3_instance('W3_Pro_FragmentCache');
$buffer .= "\r\n\r\n" . $w3_fragmentcache->_get_debug_info();
}
}
}
}
$buffer = w3tc_do_ob_callbacks(array('minify', 'newrelic', 'cdn', 'browsercache', 'pagecache'), $buffer);
}
}
return $buffer;
}
/**
* Output buffering callback
*
* @param string $buffer
* @return string
*/
function ob_callback(&$buffer)
{
if ($buffer != '' && $this->_is_cacheable_content_type()) {
$compression = false;
$has_dynamic = $this->_has_dynamic($buffer);
$can_cache = $this->_can_cache2($buffer);
if ($can_cache) {
$mobile_group = $this->_get_mobile_group();
$referrer_group = $this->_get_referrer_group();
$encryption = $this->_get_encryption();
$compression = $this->_get_compression();
$compressions = $this->_get_compressions();
/**
* Don't use compression for debug mode or dynamic tags
* because we need to modify buffer before send it to client
*/
$raw = $this->_debug || $has_dynamic;
if ($raw) {
$compression = false;
$compressions = array(false);
}
$content_type = '';
$is_404 = function_exists('is_404') ? is_404() : false;
$headers = $this->_get_cached_headers();
if ($this->_enhanced_mode && !$this->_late_init) {
$this->_check_rules_present();
if (isset($headers['Content-Type'])) {
$content_type = $headers['Content-Type'];
}
}
$time = time();
$cache = $this->_get_cache();
/**
* Store different versions of cache
*/
$buffers = array();
$group = '0';
if (!isset($this->_sitemap_matched)) {
$sitemap_regex = $this->_config->get_string('pgcache.purge.sitemap_regex');
if ($sitemap_regex && preg_match('/' . $sitemap_regex . '/', basename($this->_request_uri))) {
$group = 'sitemaps';
$this->_sitemap_matched = true;
}
} elseif ($this->_sitemap_matched) {
$group = 'sitemaps';
}
foreach ($compressions as $_compression) {
$_page_key = $this->_get_page_key($mobile_group, $referrer_group, $encryption, $_compression, $content_type);
/**
* Compress content
*/
$buffers[$_compression] = $buffer;
$this->_compress($buffers[$_compression], $_compression);
/**
* Store cache data
*/
$_data = array('404' => $is_404, 'headers' => $headers, 'time' => $time, 'content' => &$buffers[$_compression]);
$cache->set($_page_key, $_data, $this->_lifetime, $group);
}
/**
* Change buffer if using compression
*/
if ($compression && isset($buffers[$compression])) {
$buffer =& $buffers[$compression];
}
/**
* Calculate content etag
*/
$etag = md5($buffer);
/**
* Send headers
*/
$this->_send_headers($is_404, $time, $etag, $compression, $headers);
if ($raw) {
if ($this->_debug && w3_can_print_comment($buffer)) {
/**
* Set page key for debug
*/
$this->_page_key = $this->_get_page_key($mobile_group, $referrer_group, $encryption, $compression, $content_type);
/**
* Append debug info
*/
$time_total = w3_microtime() - $this->_time_start;
$debug_info = $this->_get_debug_info(true, '', false, $time_total);
$buffer .= "\r\n\r\n" . $debug_info;
}
/**
* Don't use shutdown function below
*/
if (!$has_dynamic) {
$this->_compress($buffer, $compression);
}
}
} elseif ($this->_debug && w3_can_print_comment($buffer)) {
$mobile_group = $this->_get_mobile_group();
$referrer_group = $this->_get_referrer_group();
$encryption = $this->_get_encryption();
/**
* Set page key for debug
*/
$this->_page_key = $this->_get_page_key($mobile_group, $referrer_group, $encryption, $compression);
/**
* Append debug info
*/
$time_total = w3_microtime() - $this->_time_start;
$debug_info = $this->_get_debug_info(false, $this->cache_reject_reason, false, $time_total);
$buffer .= "\r\n\r\n" . $debug_info;
}
/**
* We can't capture output in ob_callback
* so we use shutdown function
*/
if ($has_dynamic) {
$this->_shutdown_buffer = $buffer;
$this->_shutdown_compression = $compression;
$buffer = '';
register_shutdown_function(array(&$this, 'shutdown'));
}
}
return $buffer;
}