/**
* Output buffering callback
*
* @param string $buffer
* @return string
*/
function ob_callback($buffer)
{
global $wpdb;
global $w3_late_caching_succeeded;
if ($w3_late_caching_succeeded) {
return $buffer;
}
if (Util_Content::is_database_error($buffer)) {
status_header(503);
} else {
if (Util_Content::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 (Util_Environment::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')) {
$buffer .= sprintf("\r\n<!-- Served from: %s @ %s by W3 Total Cache -->", Util_Content::escape_comment($host), $date);
} else {
$strings = array();
$strings = apply_filters('w3tc_footer_comment', $strings);
$buffer .= "\r\n<!-- Performance optimized by W3 Total Cache. Learn more: https://www.w3-edge.com/products/\r\n";
if (count($strings)) {
$buffer .= "\r\n" . Util_Content::escape_comment(implode("\r\n", $strings)) . "\r\n";
}
$buffer .= sprintf("\r\n Served from: %s @ %s by W3 Total Cache -->", Util_Content::escape_comment($host), $date);
}
}
$buffer = Util_Bus::do_ob_callbacks(array('minify', 'newrelic', 'cdn', 'browsercache', 'pagecache'), $buffer);
}
return $buffer;
}
