wp-includes/class-wp-application-passwords.php:467Sanitizes and then splits a password into smaller chunks.
$raw_passwordstringstring public static function chunk_password( #[\SensitiveParameter] $raw_password ) { $raw_password = preg_replace( '/[^a-z\d]/i', '', $raw_password ); return trim( chunk_split( $raw_password, 4, ' ' ) ); }Introduced in 5.6.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wp-application-passwords.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.