_wp_filter_taxonomy_base() │ WP 2.6.0

Filters the URL base for taxonomies.

To remove any manually prepended /index.php/.

Internal function — this function is designed to be used by the kernel itself. It is not recommended to use this function in your code.

No Hooks.

Returns

String.

Usage

_wp_filter_taxonomy_base( $base );
$base(string) (required)
The taxonomy base that we're going to filter.

Changelog

Since 2.6.0 Introduced.

_wp_filter_taxonomy_base() code WP 6.8.3

wp-includes/rewrite.php 
function _wp_filter_taxonomy_base( $base ) {
	if ( ! empty( $base ) ) {
		$base = preg_replace( '|^/index\.php/|', '', $base );
		$base = trim( $base, '/' );
	}
	return $base;
}