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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.
This hook occurs 2 times in this file.
| Line | Code |
|---|---|
| 1636 | * Filters the comment author's user id before it is set. |
| 1637 | * |
| 1638 | * The first time this filter is evaluated, 'user_ID' is checked |
| 1639 | * (for back-compat), followed by the standard 'user_id' value. |
| 1640 | * |
| 1641 | * @since 1.5.0 |
| 1642 | * |
| 1643 | * @param int $user_ID The comment author's user ID. |
| 1644 | */ |
| 1645 | $commentdata['user_id'] = apply_filters( 'pre_user_id', $commentdata['user_ID'] ); |
| 1646 | } elseif ( isset( $commentdata['user_id'] ) ) { |
| 1647 | /** This filter is documented in wp-includes/comment.php */ |
| 1648 | $commentdata['user_id'] = apply_filters( 'pre_user_id', $commentdata['user_id'] ); |
| 1649 | } |
| 1650 | |
| 1651 | /** |
| 1652 | * Filters the comment author's browser user agent before it is set. |
| 1653 | * |
| 1654 | * @since 1.5.0 |
| 1655 | * |
| 1656 | * @param string $comment_agent The comment author's browser user agent. |
| 1657 | */ |