php 纯php代码实现伪静态的方法

if(1==URLROLE){
    $nav=$_SERVER["REQUEST_URI"];
    $script_name=$_SERVER["SCRIPT_NAME"];
    $nav1=ereg_replace(".html","",substr(ereg_replace("$script_name","",urldecode($nav)),1));
    $vars = @explode("/",$nav1);
    $_url = array_chunk($vars,2);
    $_GET['m'] = $vars[0]?$vars[0]:'index';//如果没有参数，默认访问index类库的index方法
    $_GET['a'] = $vars[1]?$vars[1]:'index';
    unset($_url[0]);
    if($_url){
        foreach($_url as $key=>$val){
            @$_GET[$val[0]] = $val[1];
        }
    }
//var_dump($_GET);
}
//该片段来自于http://outofmemory.cn