<?php
        function rsnum($c, $index = 1) {
            foreach($c as $k => $v)
                if(preg_match("/^\d+$/", $k) && $k == $index) unset($c[$k]);
                    return $c;
        }

        echo"<pre>\r";
        print_r(rsnum(array(
            0 => "v0",
            1 => "v1", #vai remover esse index.
            2 => "v2",
            "v0" => 0,
            "v1" => 1
        )))
?>