Remove taxonomy base from url

remove-taxonomy-base.php

<?php 

add_filter("request", "ph_change_term_request", 1, 1);
function ph_change_term_request($query)
{
	$tax_name = "my_tax_name";
	if (isset($query["attachment"]))
	{
		$include_children = true;
		$name             = $query["attachment"];
	}
	else
	{
		$include_children = false;
		$name             = (isset($query["name"])) ? $query["name"] : null;
	}
	$term = get_term_by("slug", $name, $tax_name);
	if (isset($name) && $term && !is_wp_error($term))
	{
		if ($include_children)
		{
			unset($query["attachment"]);
			$parent = $term->parent;
			while ($parent)
			{
				$parent_term = get_term($parent, $tax_name);
				$name        = $parent_term->slug . "/" . $name;
				$parent      = $parent_term->parent;
			}
		}
		else
		{
			unset($query["name"]);
		}
		switch ($tax_name)
		{
			case "category":
				$query["category_name"] = $name;
				break;
			case "post_tag":
				$query["tag"] = $name;
				break;
			default:
				$query[$tax_name] = $name;
		}
	}
	return $query;
}
add_filter("term_link", "ph_term_permalink", 10, 3);
function ph_term_permalink($url, $term, $taxonomy)
{
	$taxonomy_name = "my_tax_name";
	$taxonomy_slug = "my_tax_slug";
	if (strpos($url, $taxonomy_slug) === FALSE || $taxonomy != $taxonomy_name)
		return $url;
	$url = str_replace("/" . $taxonomy_slug, "", $url);
	return $url;
}
add_action("template_redirect", "ph_old_term_redirect");
function ph_old_term_redirect()
{
	$taxonomy_name = "my_tax_name";
	$taxonomy_slug = "my_tax_slug";
	if (strpos($_SERVER["REQUEST_URI"], $taxonomy_slug) === FALSE)
		return;
	if ((is_category() && $taxonomy_name == "category") || (is_tag() && $taxonomy_name == "post_tag") || is_tax($taxonomy_name)):
		wp_redirect(site_url(str_replace($taxonomy_slug, "", $_SERVER["REQUEST_URI"])), 301);
		exit();
	endif;
}