name : test_Bug_20564.phpt --TEST-- Bug #20564 Unsetting headers --SKIPIF-- --FILE-- <?php include("Mail/mime.php"); $mime = new Mail_mime; $mime->setSubject('test'); $headers = $mime->headers(array('Subject' => null), true); echo array_key_exists('Subject', $headers) ? '1' : '0'; --EXPECT-- 0