wp-includes/load.php:1266Sets internal encoding.
function wp_set_internal_encoding() { if ( function_exists( 'mb_internal_encoding' ) ) { $charset = get_option( 'blog_charset' ); // phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged if ( ! $charset || ! @mb_internal_encoding( $charset ) ) { mb_internal_encoding( 'UTF-8' ); } }}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/load.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.