wp-includes/formatting.php:3706Converts to ASCII from email subjects.
$subjectstringstringfunction wp_iso_descrambler( $subject ) { /* this may only work with iso-8859-1, I'm afraid */ if ( ! preg_match( '#\=\?(.+)\?Q\?(.+)\?\=#i', $subject, $matches ) ) { return $subject; } $subject = str_replace( '_', ' ', $matches[2] ); return preg_replace_callback( '#\=([0-9a-f]{2})#i', '_wp_iso_convert', $subject );}Introduced in 1.2.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/formatting.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.