February 12, 2011 
Definition:
function update_user_meta($user_id, $meta_key, $meta_value, $prev_value = '') {}
Update user meta field based on user ID.
Use the $prev_value parameter to differentiate between meta fields with the same key and user ID.
Parameters
- int $user_id: Post ID.
- string $meta_key: Metadata key.
- mixed $meta_value: Metadata value.
- mixed $prev_value: Optional. Previous value to check before removing.
Return values
returns:False on failure, true if success.
Source code
function update_user_meta($user_id, $meta_key, $meta_value, $prev_value = '') {
return update_metadata('user', $user_id, $meta_key, $meta_value, $prev_value);
}
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