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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )
apply_filters( "hook_name", "what_to_filter" )
.Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
Line | Code |
---|---|
2328 | $meta_value = maybe_serialize($meta_value); |
2329 |
|
2330 | if (empty($meta_value)) { |
2331 | return delete_usermeta($user_id, $meta_key); |
2332 | } |
2333 |
|
2334 | $cur = $wpdb->get_row( $wpdb->prepare("SELECT * FROM $wpdb->usermeta WHERE user_id = %d AND meta_key = %s", $user_id, $meta_key) ); |
2335 |
|
2336 | if ( $cur ) |
2337 | do_action( 'update_usermeta', $cur->umeta_id, $user_id, $meta_key, $meta_value ); |
2338 |
|
2339 | if ( !$cur ) |
2340 | $wpdb->insert($wpdb->usermeta, compact('user_id', 'meta_key', 'meta_value') ); |
2341 | elseif ( $cur->meta_value != $meta_value ) |
2342 | $wpdb->update($wpdb->usermeta, compact('meta_value'), compact('user_id', 'meta_key') ); |
2343 | else |
2344 | return false; |
2345 |
|
2346 | clean_user_cache( $user_id ); |