php 路由解析规则

[php]
if(isset($_SERVER['PATH_INFO'])){
      //获取路径信息(pathinfo)
      $pathinfo=explode('/',trim($_SERVER['PATH_INFO'],'/'));
      //获取$_GET['m']
      $_GET['m']=(!emptyempty($pathinfo[0])?$pathinfo[0]:'index');
      //将数组单元的开头移除
      array_shift($pathinfo);
      //获取$_GET['a]
      $_GET['a']=(!emptyempty($pathinfo[0])?$pathinfo[0]:'index');
       //将数组单元的开头移除
      array_shift($pathinfo);
      $num=count($pathinfo);
      for ($i=0;$i<$num;$i+=2){
        $_GET[$pathinfo[$i]]=$pathinfo[$i+1];
      }
}else{
      $_GET['m']=(!emptyempty($_GET['m'])?$_GET['m']:'index');
      $_GET['a']=(!emptyempty($_GET['a'])?$_GET['a']:'index');
     if($_SERVER["QUERY_STRING"]){
        $m=$_GET['m'];
        unset($_GET['m']);   //去除数组的m
        $a=$_GET['a'];
        unset($_GET['a']);   //去除数组的a

        $query=http_build_query($_GET); //组成新的URL参数
        //组合新的URL
        $url=$_SERVER['SCRIPT_NAME']."/{$m}/{$a}/".str_replace(array("&","="),"/",$query);
        header("Location:".$url);
     }
}

if(isset($_SERVER['PATH_INFO'])){
   //获取路径信息(pathinfo)
   $pathinfo=explode('/',trim($_SERVER['PATH_INFO'],'/'));
   //获取$_GET['m']
   $_GET['m']=(!empty($pathinfo[0])?$pathinfo[0]:'index');
   //将数组单元的开头移除
   array_shift($pathinfo);
   //获取$_GET['a]
   $_GET['a']=(!empty($pathinfo[0])?$pathinfo[0]:'index');
    //将数组单元的开头移除
   array_shift($pathinfo);
   $num=count($pathinfo);
   for ($i=0;$i<$num;$i+=2){
   $_GET[$pathinfo[$i]]=$pathinfo[$i+1];
   }
}else{
   $_GET['m']=(!empty($_GET['m'])?$_GET['m']:'index');
   $_GET['a']=(!empty($_GET['a'])?$_GET['a']:'index');
if($_SERVER["QUERY_STRING"]){
$m=$_GET['m'];
unset($_GET['m']);   //去除数组的m
$a=$_GET['a'];
unset($_GET['a']);   //去除数组的a

$query=http_build_query($_GET); //组成新的URL参数
//组合新的URL
$url=$_SERVER['SCRIPT_NAME']."/{$m}/{$a}/".str_replace(array("&","="),"/",$query);
header("Location:".$url);
}
}

补充：软件开发 , C++ ,