The wp_title filter is used to filter the title of the page (called with wp_title()). This filters the text appearing in the HTML <title> tag (sometimes called the “title tag” or “meta title”), not the post, page, or category title.
A plugin (or theme) can register as a content filter with the code:
Where ‘filter_function_name’ is the function WordPress should call when the content is being retrieved. Note that the filter function must return the content after it is finished processing, or the title will be blank and other plugins also filtering the content may generate errors.
filter_function_name should be unique function name. It cannot match any other function name already declared.
pre_get_document_title – short-circuits wp_get_document_title() if it returns anything other than an empty value. document_title_separator – filters the separator between title parts. document_title_parts – filters the parts that make up the document title, passed in an associative array.
Just for information, wp_title has been reinstated:
“UPDATE 12 November – wp_title has been reinstated until alternative usages have been identified and a path forward for them defined.”
/**
* Creates a nicely formatted and more specific title element text
* for output in head of document, based on current view.
*
* @param string $title Default title text for current view.
* @param string $sep Optional separator.
* @return string Filtered title.
*/
function wpdocs_filter_wp_title( $title, $sep ) {
global $paged, $page;
if ( is_feed() )
return $title;
// Add the site name.
$title .= get_bloginfo( 'name' );
// Add the site description for the home/front page.
$site_description = get_bloginfo( 'description', 'display' );
if ( $site_description && ( is_home() || is_front_page() ) )
$title = "$title $sep $site_description";
// Add a page number if necessary.
if ( $paged >= 2 || $page >= 2 )
$title = "$title $sep " . sprintf( __( 'Page %s', 'twentytwelve' ), max( $paged, $page ) );
return $title;
}
add_filter( 'wp_title', 'wpdocs_filter_wp_title', 10, 2 );
wp_title is being deprecated, see https://make.wordpress.org/core/2015/10/20/document-title-in-4-4/
Please use:
pre_get_document_title
– short-circuitswp_get_document_title()
if it returns anything other than an empty value.document_title_separator
– filters the separator between title parts.document_title_parts
– filters the parts that make up the document title, passed in an associative array.Just for information, wp_title has been reinstated:
“UPDATE 12 November – wp_title has been reinstated until alternative usages have been identified and a path forward for them defined.”
Reference link as originally given by Andrew Klimek above https://make.wordpress.org/core/2015/10/20/document-title-in-4-4/
Basic Example
In header.php:
In functions.php:
Example updated with the third parameter of the filter: