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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!' ) ); |