wp-includes/class-wp-rewrite.php:2010Sets the tag base for the tag permalink.
$tag_basestring public function set_tag_base( $tag_base ) { if ( get_option( 'tag_base' ) !== $tag_base ) { update_option( 'tag_base', $tag_base ); $this->init(); } }Introduced in 2.3.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wp-rewrite.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.