Minify_ImportProcessor::_getContent PHP Method

    private function _getContent($file, $is_imported = false)
    {
        $file = realpath($file);
        if (!$file || in_array($file, self::$filesIncluded) || false === ($content = @file_get_contents($file))) {
            // file missing, already included, or failed read
            return '';
        }
        self::$filesIncluded[] = realpath($file);
        $this->_currentDir = dirname($file);
        // remove UTF-8 BOM if present
        if (pack("CCC", 0xef, 0xbb, 0xbf) === substr($content, 0, 3)) {
            $content = substr($content, 3);
        }
        // ensure uniform EOLs
        $content = str_replace("\r\n", "\n", $content);
        // process @imports
        $pattern = '/
                @import\\s+
                (?:url\\(\\s*)?      # maybe url(
                [\'"]?               # maybe quote
                (.*?)                # 1 = URI
                [\'"]?               # maybe end quote
                (?:\\s*\\))?         # maybe )
                ([a-zA-Z,\\s]*)?     # 2 = media list
                ;                    # end token
            /x';
        $content = preg_replace_callback($pattern, array($this, '_importCB'), $content);
        // You only need to rework the import-path if the script is imported
        if (self::$_isCss && $is_imported) {
            // rewrite remaining relative URIs
            $pattern = '/url\\(\\s*([^\\)\\s]+)\\s*\\)/';
            $content = preg_replace_callback($pattern, array($this, '_urlCB'), $content);
        }
        return $this->_importedContent . $content;
    }

 private function _importCB($m)
 {
     $url = $m[1];
     $mediaList = preg_replace('/\\s+/', '', $m[2]);
     if (strpos($url, '://') > 0) {
         // protocol, leave in place for CSS, comment for JS
         return self::$_isCss ? $m[0] : "/* Minify_ImportProcessor will not include remote content */";
     }
     if ('/' === $url[0]) {
         // protocol-relative or root path
         $url = ltrim($url, '/');
         $file = realpath($_SERVER['DOCUMENT_ROOT']) . DIRECTORY_SEPARATOR . strtr($url, '/', DIRECTORY_SEPARATOR);
     } else {
         // relative to current path
         $file = $this->_currentDir . DIRECTORY_SEPARATOR . strtr($url, '/', DIRECTORY_SEPARATOR);
     }
     $obj = new Minify_ImportProcessor(dirname($file));
     $content = $obj->_getContent($file);
     if ('' === $content) {
         // failed. leave in place for CSS, comment for JS
         return self::$_isCss ? $m[0] : "/* Minify_ImportProcessor could not fetch '{$file}' */";
     }
     return !self::$_isCss || preg_match('@(?:^$|\\ball\\b)@', $mediaList) ? $content : "@media {$mediaList} {\n{$content}\n}\n";
 }