wp_get_document_title(): string

Compatibility

Present in every tracked release (6.7.7 to 7.1.0), and compiles on PHP 7.4 through 8.6-dev.

Return value

string

Tag with the document title.

Performance profile

How much work a call to wp_get_document_title() does, and what it touches: the algorithmic scaling, the Zend instruction count per call across PHP versions, the hooks it hands control to, and the core code that calls it. Measured from the compiled opcodes, not a stopwatch, so every number is identical on any machine running the same PHP version, and every function in core is ranked by cost.

Cost class

Heavy

Reaches the database via get_post().

Scaling

Constant

No loop in the body: the same number of instructions runs whatever you pass in.

Instructions

8–110

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 194.

Plugin surface

4 hooks

Third-party callbacks on 'pre_get_document_title', 'document_title_separator', 'document_title_parts' run inside this call, and their cost is not bounded by anything here.

Called by

3

3 places in core call this, so the cost is paid more often than your own code shows.

What it touches

• hookthird-party callbacksapply_filters()called directly
• optionoption read or writeget_option()one call below wp_get_document_title()
• querycontent queryget_post()one call below wp_get_document_title()

Further down the call graph this can also reach cache, serialize and transient. Those are the worst case, several calls deep and usually down an error path, not what a normal call pays.

What one call costs · 55 distinct outcomes

One number would be a lie: the work depends on which branch runs. These are every distinct cost wp_get_document_title() can have, taken from its control-flow graph on PHP 8.5.

Hooks and filters fired · 4

4 hooks fire while wp_get_document_title() runs, in this order:

1. 1
   apply_filters( pre_get_document_title )filterline 1192 (+12 into the body)

   Filters the document title before it is generated.

2. 2
   apply_filters( document_title_separator )filterline 1271 (+91 into the body)

   Filters the separator for the document title.

3. 3
   apply_filters( document_title_parts )filterline 1287 (+107 into the body)

   Filters the parts of the document title.

4. 4
   apply_filters( document_title )filterline 1298 (+118 into the body)

   Filters the document title.

Uses · 23

• apply_filters()Calls the callback functions that have been added to a filter hook.
• is_404()Determines whether the query has resulted in a 404 (returns no results).
• __()Retrieves the translation of $text.
• is_search()Determines whether the query is for a search.
• get_search_query()Retrieves the contents of the search WordPress query variable.
• is_front_page()Determines whether the query is for the front page of the site.
• get_bloginfo()Retrieves information about the current site.
• is_post_type_archive()Determines whether the query is for an existing post type archive page.
• post_type_archive_title()Displays or retrieves title for a post type archive.
• is_tax()Determines whether the query is for an existing custom taxonomy archive page.
• single_term_title()Displays or retrieves page title for taxonomy term archive.
• is_home()Determines whether the query is for the blog homepage.

Used by · 3

• _block_template_render_title_tag()Displays title tag with content, regardless of whether theme has title-tag support.
• _wp_render_title_tag()Displays title tag with content.
• get_wp_title_rss()Retrieves the blog title for the feed title.

Source code

View on Trac ↗View on GitHub ↗

1180function wp_get_document_title() {1181 1182	/**1183	 * Filters the document title before it is generated.1184	 *1185	 * Passing a non-empty value will short-circuit wp_get_document_title(),1186	 * returning that value instead.1187	 *1188	 * @since 4.4.01189	 *1190	 * @param string $title The document title. Default empty string.1191	 */1192	$title = apply_filters( 'pre_get_document_title', '' );1193	if ( ! empty( $title ) ) {1194		return $title;1195	}1196 1197	global $page, $paged;1198 1199	$title = array(1200		'title' => '',1201	);1202 1203	// If it's a 404 page, use a "Page not found" title.1204	if ( is_404() ) {1205		$title['title'] = __( 'Page not found' );1206 1207		// If it's a search, use a dynamic search results title.1208	} elseif ( is_search() ) {1209		/* translators: %s: Search query. */1210		$title['title'] = sprintf( __( 'Search Results for “%s”' ), get_search_query() );1211 1212		// If on the front page, use the site title.1213	} elseif ( is_front_page() ) {1214		$title['title'] = get_bloginfo( 'name', 'display' );1215 1216		// If on a post type archive, use the post type archive title.1217	} elseif ( is_post_type_archive() ) {1218		$title['title'] = post_type_archive_title( '', false );1219 1220		// If on a taxonomy archive, use the term title.1221	} elseif ( is_tax() ) {1222		$title['title'] = single_term_title( '', false );1223 1224		/*1225		* If we're on the blog page that is not the homepage1226		* or a single post of any post type, use the post title.1227		*/1228	} elseif ( is_home() || is_singular() ) {1229		$title['title'] = single_post_title( '', false );1230 1231		// If on a category or tag archive, use the term title.1232	} elseif ( is_category() || is_tag() ) {1233		$title['title'] = single_term_title( '', false );1234 1235		// If on an author archive, use the author's display name.1236	} elseif ( is_author() && get_queried_object() ) {1237		$author         = get_queried_object();1238		$title['title'] = $author->display_name;1239 1240		// If it's a date archive, use the date as the title.1241	} elseif ( is_year() ) {1242		$title['title'] = get_the_date( _x( 'Y', 'yearly archives date format' ) );1243 1244	} elseif ( is_month() ) {1245		$title['title'] = get_the_date( _x( 'F Y', 'monthly archives date format' ) );1246 1247	} elseif ( is_day() ) {1248		$title['title'] = get_the_date();1249	}1250 1251	// Add a page number if necessary.1252	if ( ( $paged >= 2 || $page >= 2 ) && ! is_404() ) {1253		/* translators: %s: Page number. */1254		$title['page'] = sprintf( __( 'Page %s' ), max( $paged, $page ) );1255	}1256 1257	// Append the description or site title to give context.1258	if ( is_front_page() ) {1259		$title['tagline'] = get_bloginfo( 'description', 'display' );

Changelog

Introduced in 4.4.0. Unchanged from 6.7.7 through 7.1.0.

1. 6.7.7
2. 6.8.8
3. 6.9.7
4. 7.0.4
5. 7.1.0

Signature, return type and hooks compared across 5 parsed releases.

About this page

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