wp-includes/ms-functions.php:2445Determines whether to force SSL on content.
$forcebool|nulloptionalnullboolfunction force_ssl_content( $force = null ) { static $forced_content = false; if ( ! is_null( $force ) ) { $old_forced = $forced_content; $forced_content = (bool) $force; return $old_forced; } return $forced_content;}Introduced in 2.8.5. One change between 6.7.7 and 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
$force retyped from bool to bool|null.verified against sourcesrc/wp-includes/ms-functions.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.