wp-includes/kses.php:2407Regex callback for wp_kses_decode_entities().
$matchesarraystringfunction _wp_kses_decode_entities_chr_hexdec( $matches ) { return chr( hexdec( $matches[1] ) );}Introduced in 2.9.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/kses.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.