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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 |
|---|---|
| 1659 | /** |
| 1660 | * Filter a username after it has been sanitized. |
| 1661 | * |
| 1662 | * This filter is called before the user is created or updated. |
| 1663 | * |
| 1664 | * @since 2.0.3 |
| 1665 | * |
| 1666 | * @param string $sanitized_user_login Username after it has been sanitized. |
| 1667 | */ |
| 1668 | $pre_user_login = apply_filters( 'pre_user_login', $sanitized_user_login ); |
| 1669 | |
| 1670 | //Remove any non-printable chars from the login string to see if we have ended up with an empty username |
| 1671 | $user_login = trim( $pre_user_login ); |
| 1672 | |
| 1673 | if ( empty( $user_login ) ) { |
| 1674 | return new WP_Error('empty_user_login', __('Cannot create a user with an empty login name.') ); |
| 1675 | } |
| 1676 | if ( ! $update && username_exists( $user_login ) ) { |
| 1677 | return new WP_Error( 'existing_user_login', __( 'Sorry, that username already exists!' ) ); |