wp-includes/default-constants.php:349Defines SSL-related WordPress constants.
function wp_ssl_constants() { /** * @since 2.6.0 */ if ( ! defined( 'FORCE_SSL_ADMIN' ) ) { if ( 'https' === parse_url( get_option( 'siteurl' ), PHP_URL_SCHEME ) ) { define( 'FORCE_SSL_ADMIN', true ); } else { define( 'FORCE_SSL_ADMIN', false ); } } force_ssl_admin( FORCE_SSL_ADMIN ); /** * @since 2.6.0 * @deprecated 4.0.0 */ if ( defined( 'FORCE_SSL_LOGIN' ) && FORCE_SSL_LOGIN ) { force_ssl_admin( true ); }}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/default-constants.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.