wp-includes/functions.php:6822Strips close comment and close php tags from file headers used by WP.
$strstringstringfunction _cleanup_header_comment( $str ) { return trim( preg_replace( '/\s*(?:\*\/|\?>).*/', '', $str ) );}Introduced in 2.8.0. 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.