src/AssetManager/View/Helper/Asset.php
private function appendTimestamp($filename, $queryString, $timestamp = null)
    {
        // current timestamp as default
        $timestamp = $timestamp === null ? time() : $timestamp;

        return $filename . '?' . urlencode($queryString) . '=' . $timestamp;
    }
private function appendTimestamp($filename, $queryString, $timestamp = null)
    {
        // current timestamp as default
        $timestamp = $timestamp === null ? time() : $timestamp;

        return $filename . '?' . urlencode($queryString) . '=' . $timestamp;
    }
private function appendTimestamp ( $ filename , $ queryString , $ timestamp = null ) { // current timestamp as default $ timestamp = $ timestamp === null ? time ( ) : $ timestamp ; return $ filename . '?' . urlencode ( $ queryString ) . '=' . $ timestamp ; }
Append timestamp as query param to the filename

@param string   $filename
@param string   $queryString
@param int|null $timestamp

@return string
Append timestamp as query param to the filename