wp-includes/fonts/class-wp-font-library.php:74Unregisters a previously registered font collection.
$slugstringbool public function unregister_font_collection( string $slug ) { if ( ! $this->is_collection_registered( $slug ) ) { _doing_it_wrong( __METHOD__, /* translators: %s: Font collection slug. */ sprintf( __( 'Font collection "%s" not found.' ), $slug ), '6.5.0' ); return false; } unset( $this->collections[ $slug ] ); return true; }Introduced in 6.5.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/fonts/class-wp-font-library.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.