想用PATH_INFO功能。但是不知道应该加到哪里？解决办法

<?php$hu = 'yuan';@require_once('global.php');$domain = $_POST['domain'];if($domain){    is_domain($domain) or exit( "<script language=javascript>alert('请输入正确的域名！');location.href='index.php';</script>");    $content = @file_get_contents("http://".$domain);    @require_once('cache.php');    if(file_exists("cache/cache.php")){        @require_once("cache/cache.php");        $urls = filehave($urls,$domain);    }else{        $urls = fileno($domain);    }    writeover("cache/cache.php","<?php\r\n\$urls=".vvar_export($urls).";\r\n?>");}?><meta http-equiv="Content-Type" content="text/html; charset=gb2312" /><title>网页源代码查看器</title><form id="f" action="" method="POST"><input name="domain" type="text" id="domain" class="input" size="40" url="true" value="<?php echo $domain?>"/><input name="btnS" class="but" type="submit" value="查询"  id="sub"/> </form><textarea id="content" name="content" style="width:750px;height:850px;border:1px solid #c5e2f2;overflow:visible;" cols="20" rows="65"><?php echo $content;?></textarea></div>最近查询<table><tr><td align="left" style= "word-wrap:break-word;word-break:break-all"><?php@require_once('cache/cache.php');if($urls){foreach ($urls as $key=>$v){    echo "<a href=http://www.vipcha.net/5/".$urls[$key]." target=_blank>".$urls[$key]."</a>&nbsp;&nbsp;";}}?></td></tr></table> 

<?php//在哪都能加$path_parts = pathinfo($_SERVER['REQUEST_URI']);print_r($path_parts);?>
------解决方案--------------------
网址是这样的 www.vipcha.net/5/
那么你实际访问的是 www.vipcha.net/5/index.php
如果那个 5/ 适当做参数时 那要这样才行 www.vipcha.net/index.php/5
这就是 PATH_INFO

我想实现的功能是这样的
www.vipcha.net/5/www.baidu.com
这就需要 urlrewrite 了，因为需要隐藏php文件名