wordpress元数据中的关联数组

Question

I would like to have a user meta-data field that is an associative array. Specifically, I would like to store what the user voted for any posts voted for. In other words I would like to have:

for get_user_meta($id,'vote_arr',true) to provide: Array( post_id => 1, 0, -1) where 1 0 or -1 tells me if the user voted up down or neither for that specific post.

However I am having problems retrieving just the $value of the key-value pair using get_user_meta:

I have tried all kinds of combinations:

$vote=get_user_meta(get_current_user_id(),'vote_arr['.$_POST[postId].']',true);
$vote=get_user_meta(get_current_user_id(),'vote_arr['$_POST[postId]']',true);
$vote=get_user_meta(get_current_user_id(),'vote_arr[$_POST[postId]]',true);

none of them provide just the 1,0,-1 value.

Thanks in advance.

Answer 1

save these in wp_option that will help in storing asso array. use key as "identifier_(userID)". user meta and post meta cannot store array, but wp_options can. use get_option and update_option functions to retrieve data.