Notice: Undefined index: difference in D: \ wamp \ www \ project \ model \ modelpersona.php on line 30
Fatal error: Uncaught exception 'PDOException' with message 'SQLSTATE [23000]: Integrity constraint violation: 1048 Column' difference 'can not be null' in D: \ wamp \ www \ project \ model \ modelpersona.php on line 35
I need to calculate the age with the date of birth in MVC
$_POST['diferencia'] in your Persona model. Notice: Undefined index: difference in D: \ wamp \ www \ project \ model \ modelpersona.php on line 30
atencion_cliente does not accept nulls. Fatal error: Uncaught exception 'PDOException' with message 'SQLSTATE [23000]: Integrity constraint violation: 1048 Column' difference 'can not be null' in D: \ wamp \ www \ project \ model \ modelpersona.php on line 35
The errors are clear.
Check that you get the property diferencia in your POST and in principle everything will work for you, I do not see it in your example of the form you send.