This action hook allows you to access data for a new user immediately after they are added to the database. The user id is passed to hook as an argument.
Not all user meta data has been stored in the database when this action is triggered. For example, nickname is in the database but first_name and last_name are not (as of 3.9.1). The password has already been encrypted when this action is triggered.
Typically, this hook is used for saving additional user meta passed by custom registration forms.
This hook is passed one parameter:
This example will save a first_name field passed by a custom registration field.
Also, keep in mind that validation of registration fields should not be performed within this hook! Validate using the registration_errors hook, instead (the user_register hook will not be called if registration_errors validation fails).
add_action( 'user_register', 'myplugin_registration_save', 10, 1 );
function myplugin_registration_save( $user_id ) {
if ( isset( $_POST['first_name'] ) )
update_user_meta($user_id, 'first_name', $_POST['first_name']);
}
user_register is located in /wp-includes/user.php within the function wp_insert_user()
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