php - .htaccess not redirecting successfully for pretty url's -

my .htaccess follows:

options +followsymlinks rewriteengine on  rewritecond %{request_filename} !-d rewritecond %{request_filename} !-f  rewriterule ^(.*)$ ./backend-scripts/url_parser.php 

and then, handling url redirect file url_parser.php follows.

<?php  // open file , contents in string format. $string = file_get_contents("../json/site_map.json");  // decode json string associative array. $jsonarray = json_decode($string, true);  // add trailing slash uri if not there. $requesturi = $_server['request_uri']; $requesturi .= $requesturi[ strlen($requesturi) - 1 ] == "/" ? "" : "/";  // split url @ slashes. $uriarray = explode('/', $requesturi);  // select last piece of exploded array key. $urikey = $uriarray[count($uriarray)-2];  // lookup key in sitemap // retrieve absolute file url. $abspath = $jsonarray[$urikey];  // reformulate url. $path = "../$abspath";  // include actual page. include($path);  ?> 

in order test php code, replaced

$requesturi = $_server['request_uri']; 

by following:

$requesturi = "/welcome"; 

and worked perfectly. i'm pretty sure there wrong inside .htaccess file. how can change that?

change:

rewriterule ^(.*)$ ./backend-scripts/url_parser.php 

to

rewriterule ^(.*)$ ./backend-scripts/url_parser.php?url=$1 

then change $requesturi = $_server['request_uri']; to:

$requesturi = (!empty($_get['url']))     ? $_get['url']     : ''; // no url supplied 

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warning: not pass user supplied values include(). make sure paths checked against proper whitelist, otherwise malicious user can hijack server.