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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 |
|---|---|
| 2111 | * Filters the comment author's user ID before it is set. |
| 2112 | * |
| 2113 | * The first time this filter is evaluated, `user_ID` is checked |
| 2114 | * (for back-compat), followed by the standard `user_id` value. |
| 2115 | * |
| 2116 | * @since 1.5.0 |
| 2117 | * |
| 2118 | * @param int $user_id The comment author's user ID. |
| 2119 | */ |
| 2120 | $commentdata['user_id'] = apply_filters( 'pre_user_id', $commentdata['user_ID'] ); |
| 2121 | } elseif ( isset( $commentdata['user_id'] ) ) { |
| 2122 | /** This filter is documented in wp-includes/comment.php */ |
| 2123 | $commentdata['user_id'] = apply_filters( 'pre_user_id', $commentdata['user_id'] ); |
| 2124 | } |
| 2125 | |
| 2126 | /** |
| 2127 | * Filters the comment author's browser user agent before it is set. |
| 2128 | * |
| 2129 | * @since 1.5.0 |
| 2130 | * |
| 2131 | * @param string $comment_agent The comment author's browser user agent. |
| 2132 | */ |