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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 |
|---|---|
| 1717 | $last_name = empty( $userdata['last_name'] ) ? '' : $userdata['last_name']; |
| 1718 | |
| 1719 | /** |
| 1720 | * Filters a user's last name before the user is created or updated. |
| 1721 | * |
| 1722 | * @since 2.0.3 |
| 1723 | * |
| 1724 | * @param string $last_name The user's last name. |
| 1725 | */ |
| 1726 | $meta['last_name'] = apply_filters( 'pre_user_last_name', $last_name ); |
| 1727 | |
| 1728 | if ( empty( $userdata['display_name'] ) ) { |
| 1729 | if ( $update ) { |
| 1730 | $display_name = $user_login; |
| 1731 | } elseif ( $meta['first_name'] && $meta['last_name'] ) { |
| 1732 | /* translators: 1: User's first name, 2: Last name. */ |
| 1733 | $display_name = sprintf( _x( '%1$s %2$s', 'Display name based on first name and last name' ), $meta['first_name'], $meta['last_name'] ); |
| 1734 | } elseif ( $meta['first_name'] ) { |
| 1735 | $display_name = $meta['first_name']; |