wp-includes/link-template.php:4228Sends a Link: rel=shortlink header if a shortlink is defined for the current page.
function wp_shortlink_header() { if ( headers_sent() ) { return; } $shortlink = wp_get_shortlink( 0, 'query' ); if ( empty( $shortlink ) ) { return; } header( 'Link: <' . $shortlink . '>; rel=shortlink', false );}Introduced in 3.0.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/link-template.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.