namncn/remove-category-or-custom-taxonomy-slugs-from-url.php

## remove-category-or-custom-taxonomy-slugs-from-url.php
<?php
/**
 * Change Term Request.
 */
function pixelplus_change_term_request( $query ) {

	$tax_name = 'product_cat'; // specify you taxonomy name here, it can be also 'category' or 'post_tag'

	// Request for child terms differs, we should make an additional check
	if ( $query['attachment'] ) :
		$include_children = true;
		$name             = $query['attachment'];
	else:
		$include_children = false;
		$name             = $query['name'];
	endif;

	$term = get_term_by( 'slug', $name, $tax_name ); // get the current term to make sure it exists

	if ( isset( $name ) && $term && !is_wp_error( $term ) ): // check it here

		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; // for categories
				break;
			}
			case 'post_tag':{
				$query['tag'] = $name; // for post tags
				break;
			}
			default:{
				$query[$tax_name] = $name; // for another taxonomies
				break;
			}
		endswitch;

	endif;

	return $query;

}
add_filter( 'request', 'pixelplus_change_term_request', 1, 1 );

/**
 * Change Term Permalink.
 */
function pixelplus_term_permalink( $url, $term, $taxonomy ) {

	$taxonomy_name = 'product_cat'; // your taxonomy name here
	$taxonomy_slug = 'product-category'; // Cái này là đường dẫn bạn setting trong Permalink, ví dụ "danh-muc" (đối với Woocommerce mặc định không cài đặt gì thì nó là "product-category")
	// exit the function if taxonomy slug is not in URL
	if ( FALSE === strpos( $url, $taxonomy_slug ) || $taxonomy != $taxonomy_name ) {
		return $url;
	}

	$url = str_replace( '/' . $taxonomy_slug, '', $url );

	return $url;
}
add_filter( 'term_link', 'pixelplus_term_permalink', 10, 3 );

/**
 * Redirect Old Term.
 */
function pixelplus_old_term_redirect() {

	$taxonomy_name = 'product_cat';
	$taxonomy_slug = 'product-category'; // Cái này là đường dẫn bạn setting trong Permalink, ví dụ "danh-muc" (đối với Woocommerce mặc định không cài đặt gì thì nó là "product-category")

	// exit the redirect function if taxonomy slug is not in URL
	if ( FALSE === strpos( $_SERVER['REQUEST_URI'], $taxonomy_slug ) ) {
		return;
	}

	if ( ( is_category() && 'category' == $taxonomy_name ) || ( is_tag() && 'post_tag' == $taxonomy_name ) || is_tax( $taxonomy_name ) ) :
 		wp_redirect( site_url( str_replace( $taxonomy_slug, '', $_SERVER['REQUEST_URI'] ) ), 301 );
		exit();
	endif;

}
add_action( 'template_redirect', 'pixelplus_old_term_redirect' );