get_the_tag_list() │ WP 2.3.0

Retrieve the tags for a post formatted as a string.

Uses: get_the_term_list()
Used By: the_tags()
1 time — 0.004159 sec (very slow) | 50000 times — 3.69 sec (fast) | PHP 7.1.2, WP 4.7.3
Hooks from the function

Return

String|false|WP_Error. A list of tags on success, false if there are no terms, WP_Error on failure.

Usage

get_the_tag_list( $before, $sep, $after, $post_id );
$before(string)
String to use before the tags.
Default: ''
$sep(string)
String to use between the tags.
Default: ''
$after(string)
String to use after the tags.
Default: ''
$post_id(int)
Post ID.
Default: current post ID

Changelog

Since 2.3.0 Introduced.

Code of get_the_tag_list() WP 6.0.1

wp-includes/category-template.php 
function get_the_tag_list( $before = '', $sep = '', $after = '', $post_id = 0 ) {
	$tag_list = get_the_term_list( $post_id, 'post_tag', $before, $sep, $after );

	/**
	 * Filters the tags list for a given post.
	 *
	 * @since 2.3.0
	 *
	 * @param string $tag_list List of tags.
	 * @param string $before   String to use before the tags.
	 * @param string $sep      String to use between the tags.
	 * @param string $after    String to use after the tags.
	 * @param int    $post_id  Post ID.
	 */
	return apply_filters( 'the_tags', $tag_list, $before, $sep, $after, $post_id );
}

WP Loop

For posts