Rewrite the "Category base" and "Tag base".php

/*** Rewrite the "Category base" and "Tag base"
–––––––––––––––––––––––––––––––––––––––––––––––––– ***/
add_action( 'init', function() {

	global $wp_rewrite;

	// Set clean category and tag bases
	$wp_rewrite->category_base = 'sort-by';
	$wp_rewrite->tag_base      = 'sort-by/tag';

	// Prevent Permalink "Custom Structure" prefix from attaching to taxonomies
	$wp_rewrite->use_trailing_slashes = true;

	// Register a manual rewrite rule for /sort-by/tag/ URLs
	add_rewrite_rule(
		'^sort-by/tag/([^/]+)/?$',
		'index.php?tag=$matches[1]',
		'top'
	);

	// Flush rewrite rules only if necessary (e.g., after code changes)
	if ( get_option( 'wsv_rewrites_flushed' ) !== '1.0' ) {
		flush_rewrite_rules( false );
		update_option( 'wsv_rewrites_flushed', '1.0' );
	}
}, 20);