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I'd like my template to read in a custom field, and update the number by one.

Here's my code

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$team_member = get_userdata(intval($team_member_id));
$team_member_donations_collected = $team_member->wp_s2member_custom_fields["donations_collected"];

$team_member_donations_collected_update = (int)$team_member_donations_collected + (int)$amount;

//this last line causes an error
update_usermeta( $team_member_id, wp_s2member_custom_fields["donations_collected"], $team_member_donations_collected_update );


How should I be updating this custom field with the new number?

Ok I figured out that I need to use: http://codex.wordpress.org/Function_Ref ... _user_meta

But could anyone provide the syntax for this use case?

OK so here we go, is there an update_user_field to compliment get_user_field?

viewtopic.php?f=40&t=12453&src_doc_v=110815#src_doc_get_user_field()

Try this and print_r it.

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$s2_custom_fields = get_user_option('wp_s2member_custom_fields', $user_id);  

Then try editing the values and update_user_option. https://codex.wordpress.org/Function_Re ... ser_option

Let me know if it helps.