wp-includes/rewrite.php:206Adds a permalink structure.
$namestring$structstring$argsarrayoptionalarray()function add_permastruct( $name, $struct, $args = array() ) { global $wp_rewrite; // Back-compat for the old parameters: $with_front and $ep_mask. if ( ! is_array( $args ) ) { $args = array( 'with_front' => $args ); } if ( func_num_args() === 4 ) { $args['ep_mask'] = func_get_arg( 3 ); } $wp_rewrite->add_permastruct( $name, $struct, $args );}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/rewrite.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.