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Bugs & Features
<?php print_r(unserialize('a:3:{s:7:"groupOp";s:3:"AND";s:5:"rules";a:0:{}s:6:"groups";a:1:{i:0;a:2:{s:7:"groupOp";s:3:"AND";s:5:"rules";a:1:{i:0;a:4:{s:5:"field";s:18:"a_appointment_date";s:2:"op";s:2:"bt";s:4:"data";s:42:"2013-10-21 00:00:00 to 2013-10-21 23:59:59";s:12:"php_function";s:25:"getInitialAppointmentDate";}}}}}'));
Output for 4.3.0 - 7.1.0
Array ( [groupOp] => AND [rules] => Array ( ) [groups] => Array ( [0] => Array ( [groupOp] => AND [rules] => Array ( [0] => Array ( [field] => a_appointment_date [op] => bt [data] => 2013-10-21 00:00:00 to 2013-10-21 23:59:59 [php_function] => getInitialAppointmentDate ) ) ) ) )