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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 |
|---|---|
| 2065 | * Filters the comment author's user ID before it is set. |
| 2066 | * |
| 2067 | * The first time this filter is evaluated, 'user_ID' is checked |
| 2068 | * (for back-compat), followed by the standard 'user_id' value. |
| 2069 | * |
| 2070 | * @since 1.5.0 |
| 2071 | * |
| 2072 | * @param int $user_ID The comment author's user ID. |
| 2073 | */ |
| 2074 | $commentdata['user_id'] = apply_filters( 'pre_user_id', $commentdata['user_ID'] ); |
| 2075 | } elseif ( isset( $commentdata['user_id'] ) ) { |
| 2076 | /** This filter is documented in wp-includes/comment.php */ |
| 2077 | $commentdata['user_id'] = apply_filters( 'pre_user_id', $commentdata['user_id'] ); |
| 2078 | } |
| 2079 | |
| 2080 | /** |
| 2081 | * Filters the comment author's browser user agent before it is set. |
| 2082 | * |
| 2083 | * @since 1.5.0 |
| 2084 | * |
| 2085 | * @param string $comment_agent The comment author's browser user agent. |
| 2086 | */ |