<?php

/**
 * $Id$
 * Filename : rewrite.mod.php
 * Author   : 额系菜屁屁 Zandy
 * Email    : [email]lianxiwoo@gmail.com[/email] | hotmail.com
 * Create   : 200606
 * LastMod  : 2006
 * Usage    : 只需在你所有的页面有输出之前包含此文件即可判断你的环境是否支持 path_info
 *
 * $_SERVER['PATH_INFO_SURPORT'] 为 1 说明环境支持，为 0 不支持
 * $_SERVER['MOD_REWRITE_OPEN']  为 1 说明系统用了 path_info 为 0 说明没有用
*/

//ini_set('display_errors', 1);
//error_reporting(E_ALL ^ E_NOTICE);
//header("Content-Type: text/plain");
//header("Content-type: text/html; charset=UTF-8");


// {{{ 判断是否支持 path_info
if (isset($_GET['testModRewrite']) && $_GET['testModRewrite']){
    if (str_replace($_SERVER['SCRIPT_NAME'], '', $_SERVER['PHP_SELF'])){
        die('1');
    }else{
        die('');
    }
}
$a_20060623 = strtolower(str_replace(strstr($_SERVER['SERVER_PROTOCOL'], '/'), "", $_SERVER['SERVER_PROTOCOL'])).'://'.$_SERVER['HTTP_HOST'].$_SERVER['SCRIPT_NAME'];
if ($a_20060623 = file_get_contents($a_20060623.'/a/1?testModRewrite=1')){
    $_SERVER['PATH_INFO_SURPORT'] = 1;
}else{
    $_SERVER['PATH_INFO_SURPORT'] = 0;
}
unset($a_20060623);
// }}}
// {{{
/**
 * 注意：stristr 需要 php5 支持
 *
 * @createtime   20060623
 * @author       屁屁注：此作者还是楼主，我这里只是做个补充，谢谢，^_^
 * @modifiedby   $LastChangedBy:  $
 * @parameter    
 * @return       
 * @throws       none
*/
function mod_rewrite(){
    if(isset($_SERVER['PATH_INFO']) && !stristr($_SERVER['SERVER_SOFTWARE'], 'Abyss')){
        $pi = substr($_SERVER['PATH_INFO'], 1);
        $pi = explode('/', $pi);
        $a = sizeof($pi);
        $qs = array();
        for($i = 0; $i < $a; $i += 2){
            if ('' != $pi[$i]){
                $_GET[$pi[$i]] = $pi[$i+1];
                $qs[] = $pi[$i].'='.$pi[$i+1];
            }
        }
        $_SERVER['QUERY_STRING'] = join("&", $qs);
        $_SERVER['PHP_SELF']     = str_replace($_SERVER['PATH_INFO'], "", $_SERVER['REQUEST_URI']);
        $_SERVER['REQUEST_URI']  = $_SERVER['PHP_SELF'].($_SERVER['QUERY_STRING'] ? '?'.$_SERVER['QUERY_STRING'] : '');
        $_SERVER['SCRIPT_URL']   = $_SERVER['PHP_SELF'];
        $_SERVER['SCRIPT_URI']   = strtolower(str_replace(strstr($_SERVER['SERVER_PROTOCOL'], '/'), "", $_SERVER['SERVER_PROTOCOL'])).'://'.$_SERVER['HTTP_HOST'].$_SERVER['PHP_SELF'];
        $_SERVER['MOD_REWRITE_OPEN']  = 1;
    }else{
        $_SERVER['MOD_REWRITE_OPEN']  = 0;
    }
}

mod_rewrite();

/**/
echo '<xmp>';
print_r($_SERVER);
echo '</xmp>';


// }}}

?>

from: http://www.phpx.com/happy/thread-119385-1-1.html