What is wrong with this INTERVAL syntax in my PHP MYSQL code?

Question

I can't seem to get the database to update when INTERVAL is set

$update_query="UPDATE subscriber SET txn_type='$txn_type', expire_date=(CURDATE(),INTERVAL 1 MONTH), subscription_type='$item_name', last_payment = NOW(), subscr_id ='$subscr_id', txnid = '$txn_id', payment_status='paid' WHERE id= '$id'"; 

But w/o INTERVAL it works fine

$update_query="UPDATE subscriber SET txn_type='$txn_type', expire_date=CURDATE(), subscription_type='$item_name', last_payment = NOW(), subscr_id ='$subscr_id', txnid = '$txn_id', payment_status='paid' WHERE id= '$id'"; 

Everywhere I look, this seems to be the correct way to set interval. Am I missing something?

Answer 1

我猜你是说要增加1个月：

expire_date= CURDATE() + INTERVAL 1 MONTH,

Answer 2

尝试这个

  expire_date=DATE_ADD(NOW(), INTERVAL 1 MONTH)