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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 |
|---|---|
| 2193 | * Filters the comment author's user ID before it is set. |
| 2194 | * |
| 2195 | * The first time this filter is evaluated, `user_ID` is checked |
| 2196 | * (for back-compat), followed by the standard `user_id` value. |
| 2197 | * |
| 2198 | * @since 1.5.0 |
| 2199 | * |
| 2200 | * @param int $user_id The comment author's user ID. |
| 2201 | */ |
| 2202 | $commentdata['user_id'] = apply_filters( 'pre_user_id', $commentdata['user_ID'] ); |
| 2203 | } elseif ( isset( $commentdata['user_id'] ) ) { |
| 2204 | /** This filter is documented in wp-includes/comment.php */ |
| 2205 | $commentdata['user_id'] = apply_filters( 'pre_user_id', $commentdata['user_id'] ); |
| 2206 | } |
| 2207 | |
| 2208 | /** |
| 2209 | * Filters the comment author's browser user agent before it is set. |
| 2210 | * |
| 2211 | * @since 1.5.0 |
| 2212 | * |
| 2213 | * @param string $comment_agent The comment author's browser user agent. |
| 2214 | */ |