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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 |
|---|---|
| 1638 | $last_name = ''; |
| 1639 | |
| 1640 | /** |
| 1641 | * Filter a user's last name before the user is created or updated. |
| 1642 | * |
| 1643 | * @since 2.0.3 |
| 1644 | * |
| 1645 | * @param string $last_name The user's last name. |
| 1646 | */ |
| 1647 | $last_name = apply_filters( 'pre_user_last_name', $last_name ); |
| 1648 | |
| 1649 | if ( empty( $display_name ) ) { |
| 1650 | if ( $update ) |
| 1651 | $display_name = $user_login; |
| 1652 | elseif ( $first_name && $last_name ) |
| 1653 | /* translators: 1: first name, 2: last name */ |
| 1654 | $display_name = sprintf( _x( '%1$s %2$s', 'Display name based on first name and last name' ), $first_name, $last_name ); |
| 1655 | elseif ( $first_name ) |
| 1656 | $display_name = $first_name; |