$sub_fields = array(
array('GROUPFIELDNAME' =>
array('GROUPSUBFIELDNAME' => $GROUPSUBFIELDVALUE),
'acf_fc_layout' => 'FLEXIBLECONTENTNAME')
);
update_field('field_59778f7a4af43', $sub_fields, $post->ID);
$sub_fields = array(
array('GROUPFIELDNAME' =>
array('GROUPSUBFIELDNAME' => $GROUPSUBFIELDVALUE),
'acf_fc_layout' => 'FLEXIBLECONTENTNAME')
);
update_field('field_59778f7a4af43', $sub_fields, $post->ID);
Which key id added in update_field function?
group field key or sub field key?