wp-includes/functions.php:7725Resets the mbstring internal encoding to a users previously set encoding.
function reset_mbstring_encoding() { mbstring_binary_safe_encoding( true );}Introduced in 3.7.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/functions.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.