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 <?php
 function is_current( $uri = "" ) {
    $uri = trim( $uri, "/" );
    $request_uri = $_SERVER['REQUEST_URI'];

    if( $uri && strpos($request_uri."/", "".$uri."", 0) !== FALSE ) {
        return true;
    }
    $request_uri = trim(str_replace( "/index.php", "", $request_uri ), '/'); // top
    if( !$uri && !$request_uri ) {
        return true;
    }
    return false;
}
function echo_current( $uri = "" ) {
    if(is_current( $uri )) {
        echo '_on';
    } else {
    	echo '_off';
    };
}
?>