[wp-trac] Re: [WordPress Trac] #7540: allow multiple values for key in usermeta

[WordPress Trac]

#7540: allow multiple values for key in usermeta
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 Reporter:  wnorris      |        Type:  enhancement
   Status:  new          |    Priority:  normal     
Milestone:  2.8          |   Component:  Users      
  Version:  2.6.1        |    Severity:  normal     
 Keywords:  needs-patch  |  
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Comment(by Denis-de-Bernardy):

 in the patch I uploaded, the various *_user_meta() functions do not behave
 exactly the same as the *_usermeta() functions. but it's mostly to get a
 2nd opinion on the method.

 usage would be as follows for single-key options:

 {{{
 add_user_meta($user_id, 'foo', 'bar', true);
 get_user_meta($user_id, 'foo');
 update_user_meta($user_id, 'foo', 'bar');
 delete_user_meta($user_id, 'foo');
 }}}

 and for multi-key options:

 {{{
 add_user_meta($user_id, 'foo', 'bar');
 get_user_meta($user_id, 'foo');
 update_user_meta($user_id, 'foo', 'bar', 'old');
 delete_user_meta($user_id, 'foo', 'old');
 }}}

 in other words, the meta key would have to be initially declared as multi-
 key, else it'll get treated (always) as a single key.

 one very questionable option I took is in update_user_meta(): it assumes
 that anything passed *with* a previous value will be a multi-key option;
 and anything without one is a single-key option.

-- 
Ticket URL: <http://core.trac.wordpress.org/ticket/7540#comment:21>
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