thinkphp中U方法按路由规则生成url的方法

//更改模块配置文件
'URL_ROUTER_ON'   => true, 
'URL_ROUTE_RULES'=>[]//编写路由优化

if(C('URL_ROUTE_RULES')){
 foreach (C('URL_ROUTE_RULES') as $rule=>$real) {
  if(strpos($url, $real)!==false){
   $url = str_replace($real, $rule, $url);
   preg_match("/\/(\w+)\.php\/(\w+)/", $url, $match);
   if(isset($match[1]) && isset($match[2]) && $match[1][0]==$match[2][0]){
    $url = preg_replace("/\/(\w+)\.php/", '', $url);
   }elseif(strpos($url, 'index.php')!==false){
    $url = str_replace("/index.php", '', $url);
   }else{
    $url = str_replace(".php", '', $url);
   }

   preg_match_all("/(:\w+)/", $rule, $matches);
   foreach ((array)$matches[1] as $match) {
    $url = str_replace($match . '/', '', $url);
    $url = str_replace(substr($match, 1) . '/', '', $url);
   }
  } 
 } 
}