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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 |
|---|---|
| 164 | foreach ($comment as $key => $value) |
| 165 | $comment[$key] = $wpdb->escape($value); |
| 166 | |
| 167 | // Merge old and new fields with new fields overwriting old ones. |
| 168 | $commentarr = array_merge($comment, $commentarr); |
| 169 | |
| 170 | // Now extract the merged array. |
| 171 | extract($commentarr); |
| 172 | |
| 173 | $comment_content = apply_filters('comment_save_pre', $comment_content); |
| 174 | |
| 175 | $result = $wpdb->query( |
| 176 | "UPDATE $wpdb->comments SET |
| 177 | comment_content = '$comment_content', |
| 178 | comment_author = '$comment_author', |
| 179 | comment_author_email = '$comment_author_email', |
| 180 | comment_approved = '$comment_approved', |
| 181 | comment_author_url = '$comment_author_url', |
| 182 | comment_date = '$comment_date' |