wp-includes/kses.php:2071Callback for wp_kses_normalize_entities() for regular expression.
$matchesarraystringfunction wp_kses_normalize_entities3( $matches ) { if ( empty( $matches[1] ) ) { return ''; } $hexchars = $matches[1]; return ( ! valid_unicode( hexdec( $hexchars ) ) ) ? "&#x$hexchars;" : '&#x' . ltrim( $hexchars, '0' ) . ';';}Introduced in 2.7.0. 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.