public static function var_dump($var, $return = false, $expandLevel = 1)
    {
        self::$hasArray = false;
        $toggScript = 'var colToggle = function(toggID) {var img = document.getElementById(toggID);if (document.getElementById(toggID + "-collapsable").style.display == "none") {document.getElementById(toggID + "-collapsable").style.display = "inline";setImg(toggID, 0);var previousSibling = document.getElementById(toggID + "-collapsable").previousSibling;while (previousSibling != null && (previousSibling.nodeType != 1 || previousSibling.tagName.toLowerCase() != "br")) {previousSibling = previousSibling.previousSibling;}} else {document.getElementById(toggID + "-collapsable").style.display = "none";setImg(toggID, 1);var previousSibling = document.getElementById(toggID + "-collapsable").previousSibling; while (previousSibling != null && (previousSibling.nodeType != 1 || previousSibling.tagName.toLowerCase() != "br")) {previousSibling = previousSibling.previousSibling;}}};';
        $imgScript = 'var setImg = function(objID,imgID,addStyle) {var imgStore = ["data:image/png;base64,' . self::$icon_collapse . '", "data:image/png;base64,' . self::$icon_expand . '"];if (objID) {document.getElementById(objID).setAttribute("src", imgStore[imgID]);if (addStyle){document.getElementById(objID).setAttribute("style", "position:relative;left:-5px;top:-1px;cursor:pointer;");}}};';
        $jsCode = preg_replace('/ +/', ' ', '<script>' . $toggScript . $imgScript . '</script>');
        $html = '<pre style="margin-bottom: 18px;' .
            'background: #f7f7f9;' .
            'border: 1px solid #e1e1e8;' .
            'padding: 8px;' .
            'border-radius: 4px;' .
            '-moz-border-radius: 4px;' .
            '-webkit-border radius: 4px;' .
            'display: block;' .
            'font-size: 12.05px;' .
            'white-space: pre-wrap;' .
            'word-wrap: break-word;' .
            'color: #333;' .
            'font-family: Menlo,Monaco,Consolas,\'Courier New\',monospace;">';
        $done  = array();
        $html .= self::recursiveVarDumpHelper($var, intval($expandLevel), 0, $done);
        $html .= '</pre>';

        if (self::$hasArray) {
            $html = $jsCode . $html;
        }

        if (!$return) {
            echo $html;
        }

        return $html;
    }