update_sub_field not working!

• faticesko

• November 20, 2014 at 11:57 pm

I just bought acf pro because I need to work with repeater field in front-end.
I would like to update my repeater sub field but I can’t do with this function.

my code is:

$field_key = 'field_545b7d81cadbb';
//$field_key = 'biography'; //also i try with field name

I would like to update my first row in this situation, but not working!
update_sub_field( array($field_key, 0, 'title'), 'This caption is for the first row of the repeater!' );