wp-admin/includes/class-wp-users-list-table.php:394Gets a list of sortable columns for the list table.
array protected function get_sortable_columns() { $columns = array( 'username' => array( 'login', false, __( 'Username' ), __( 'Table ordered by Username.' ), 'asc' ), 'email' => array( 'email', false, __( 'E-mail' ), __( 'Table ordered by E-mail.' ) ), ); return $columns; }Introduced in 3.1.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-admin/includes/class-wp-users-list-table.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.