default dates over-riding form dates.

While looking into why contribution receipt dates are being set to null for credit card membership payments I realised the join , start , end dates from the form were being over-written because the array_merge was the wrong way around. Decided to create separate job for QA / issue searching.

ie. change
$membershipParams = array_merge($params,$membershipTypeValues[$memType]);

to
$membershipParams = array_merge($membershipTypeValues[$memType],$params);