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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 |
|---|---|
| 1708 | $raw_user_email = empty( $userdata['user_email'] ) ? '' : $userdata['user_email']; |
| 1709 | |
| 1710 | /** |
| 1711 | * Filter a user's email before the user is created or updated. |
| 1712 | * |
| 1713 | * @since 2.0.3 |
| 1714 | * |
| 1715 | * @param string $raw_user_email The user's email. |
| 1716 | */ |
| 1717 | $user_email = apply_filters( 'pre_user_email', $raw_user_email ); |
| 1718 | |
| 1719 | if ( ! $update && ! defined( 'WP_IMPORTING' ) && email_exists( $user_email ) ) { |
| 1720 | return new WP_Error( 'existing_user_email', __( 'Sorry, that email address is already used!' ) ); |
| 1721 | } |
| 1722 | $nickname = empty( $userdata['nickname'] ) ? $user_login : $userdata['nickname']; |
| 1723 | |
| 1724 | /** |
| 1725 | * Filter a user's nickname before the user is created or updated. |
| 1726 | * |