phpファイルにデータを書き込む

**
 *        
 *
 * @params  string  $cache_name     
 * @params  string  $caches     
 *
 * @return
 */
function write_static_cache($cache_name, $caches)
{
    
    $cache_file_path = ROOT_PATH . '/temp/static_caches/' . $cache_name . '.php';
    $content = "";
    $content .= "\$data = " . var_export($caches, true) . ";\r
";
    $content .= "??>";
    file_put_contents($cache_file_path, $content, LOCK_EX);
}


/**
 *        
 *
 * @params  string  $cache_name
 *
 * @return  array   $data
 */
function read_static_cache($cache_name)
{ 
    static $result = array();
    if (!empty($result[$cache_name]))
    {
        return $result[$cache_name];
    }
    $cache_file_path = ROOT_PATH . '/temp/static_caches/' . $cache_name . '.php';
    if (file_exists($cache_file_path))
    {
        include_once($cache_file_path);
        $result[$cache_name] = $data;
        return $result[$cache_name];
    }
    else
    {
        return false;
    }
}