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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 |
|---|---|
| 1554 | /** |
| 1555 | * Filter a username after it has been sanitized. |
| 1556 | * |
| 1557 | * This filter is called before the user is created or updated. |
| 1558 | * |
| 1559 | * @since 2.0.3 |
| 1560 | * |
| 1561 | * @param string $user_login Username after it has been sanitized. |
| 1562 | */ |
| 1563 | $user_login = apply_filters( 'pre_user_login', $user_login ); |
| 1564 | |
| 1565 | //Remove any non-printable chars from the login string to see if we have ended up with an empty username |
| 1566 | $user_login = trim($user_login); |
| 1567 | |
| 1568 | if ( empty($user_login) ) |
| 1569 | return new WP_Error('empty_user_login', __('Cannot create a user with an empty login name.') ); |
| 1570 | |
| 1571 | if ( !$update && username_exists( $user_login ) ) |
| 1572 | return new WP_Error( 'existing_user_login', __( 'Sorry, that username already exists!' ) ); |