advagg.advagg.inc

<?php


/**
 * @file
 * Advanced CSS/JS aggregation module.
 *
 * File used to store hook_advagg_* hooks.
 */

/**
 * Implements hook_advagg_scan_file_alter().
 *
 * Used to make sure the add/modify the file meta data saved in the database.
 */
function advagg_advagg_scan_file_alter($file, &$data) {
    // Capture hosts for DNS prefetching.
    // Skip if not a css file.
    if (empty($data['fileext']) || $data['fileext'] !== 'css') {
        return;
    }
    // Get domain names in this css file.
    $matches = [];
    $pattern = '%url\\(\\s*+[\'"]?+(http:\\/\\/|https:\\/\\/|\\/\\/)([^\'"()\\s]++)[\'"]?+\\s*+\\)%i';
    preg_match_all($pattern, $data['contents'], $matches);
    $urls = [];
    if (!empty($matches[1])) {
        foreach ($matches[1] as $key => $match) {
            $parse = @parse_url($match . $matches[2][$key]);
            if (!empty($parse['host']) && empty($urls[$parse['host']])) {
                $urls[$parse['host']] = $parse['host'];
            }
        }
        $urls = array_values($urls);
    }
    if (!empty($urls)) {
        $data['dns_prefetch'] = $urls;
    }
}