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Retrieves a trailing-slashed string if the site is set for adding trailing slashes.

Description

Conditionally adds a trailing slash if the permalink structure has a trailing slash, strips the trailing slash if not. The string is passed through the ‘user_trailingslashit’ filter. Will remove trailing slash from string, if site is not set to have them.

Parameters

$urlstringrequired: URL with or without a trailing slash.
$type_of_urlstringoptional: The type of URL being considered (e.g. single, category, etc) for use in the filter. Default empty string.

Return

string The URL with the trailing slash appended or stripped.

Source

function user_trailingslashit( $url, $type_of_url = '' ) {
	global $wp_rewrite;
	if ( $wp_rewrite->use_trailing_slashes ) {
		$url = trailingslashit( $url );
	} else {
		$url = untrailingslashit( $url );
	}

	/**
	 * Filters the trailing-slashed string, depending on whether the site is set to use trailing slashes.
	 *
	 * @since 2.2.0
	 *
	 * @param string $url         URL with or without a trailing slash.
	 * @param string $type_of_url The type of URL being considered. Accepts 'single', 'single_trackback',
	 *                            'single_feed', 'single_paged', 'commentpaged', 'paged', 'home', 'feed',
	 *                            'category', 'page', 'year', 'month', 'day', 'post_type_archive'.
	 */
	return apply_filters( 'user_trailingslashit', $url, $type_of_url );
}

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Hooks

apply_filters( ‘user_trailingslashit’, string $url, string $type_of_url ): Filters the trailing-slashed string, depending on whether the site is set to use trailing slashes.

Uses	Description
untrailingslashit()`wp-includes/formatting.php`	Removes trailing forward slashes and backslashes if they exist.
trailingslashit()`wp-includes/formatting.php`	Appends a trailing slash.
apply_filters()`wp-includes/plugin.php`	Calls the callback functions that have been added to a filter hook.

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Used by	Description
wp_get_canonical_url()`wp-includes/link-template.php`	Returns the canonical URL for a post.
get_post_embed_url()`wp-includes/embed.php`	Retrieves the URL to embed a specific post in an iframe.
paginate_links()`wp-includes/general-template.php`	Retrieves paginated links for archive post pages.
get_index_rel_link()`wp-includes/deprecated.php`	Get site index relational link.
wp_old_slug_redirect()`wp-includes/query.php`	Redirect old slugs to the correct permalink.
get_term_link()`wp-includes/taxonomy.php`	Generates a permalink for a taxonomy term archive.
get_comments_pagenum_link()`wp-includes/link-template.php`	Retrieves the comments page number link.
paginate_comments_links()`wp-includes/link-template.php`	Displays or retrieves pagination links for the comments on the current post.
get_pagenum_link()`wp-includes/link-template.php`	Retrieves the link for a page number.
get_post_type_archive_link()`wp-includes/link-template.php`	Retrieves the permalink for a post type archive.
get_term_feed_link()`wp-includes/link-template.php`	Retrieves the feed link for a term.
get_search_link()`wp-includes/link-template.php`	Retrieves the permalink for a search.
get_month_link()`wp-includes/link-template.php`	Retrieves the permalink for the month archives with year.
get_day_link()`wp-includes/link-template.php`	Retrieves the permalink for the day archives with year and month.
get_feed_link()`wp-includes/link-template.php`	Retrieves the permalink for the feed type.
get_post_comments_feed_link()`wp-includes/link-template.php`	Retrieves the permalink for the post comments feed.
get_author_feed_link()`wp-includes/link-template.php`	Retrieves the feed link for a given author.
get_permalink()`wp-includes/link-template.php`	Retrieves the full permalink for the current post or post ID.
get_post_permalink()`wp-includes/link-template.php`	Retrieves the permalink for a post of a custom post type.
_get_page_link()`wp-includes/link-template.php`	Retrieves the page permalink.
get_attachment_link()`wp-includes/link-template.php`	Retrieves the permalink for an attachment.
get_year_link()`wp-includes/link-template.php`	Retrieves the permalink for the year archives.
_wp_link_page()`wp-includes/post-template.php`	Helper function for wp_link_pages() .
redirect_canonical()`wp-includes/canonical.php`	Redirects incoming links to the proper URL based on the site url.
redirect_guess_404_permalink()`wp-includes/canonical.php`	Attempts to guess the correct URL for a 404 request based on query vars.
get_author_posts_url()`wp-includes/author-template.php`	Retrieves the URL to the author page for the user with the ID provided.
get_trackback_url()`wp-includes/comment-template.php`	Retrieves the current post’s trackback URL.
get_comment_link()`wp-includes/comment-template.php`	Retrieves the link to a given comment.

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Changelog

Version	Description
2.2.0	Introduced.

User Contributed Notes

Divyesh kakrecha 5 years ago

-3

you can remove category from wordpress url. See example below.

function wpdocs_remove_category( $string, $type ) {
	if ( 'single' !== $type && 'category' === $type && false !== strpos( $string, 'category' ) ) {
		$url_without_category = str_replace( '/category/', '/', $string );
		return trailingslashit( $url_without_category );
	}      
	return $string;
}    
add_filter( 'user_trailingslashit', 'wpdocs_remove_category', 100, 2 );

user_trailingslashit( string $url, string $type_of_url ): string

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