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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 | 
|---|---|
| 953 |  * @uses do_action() Calls 'comment_post' hook on $comment_ID returned from adding the comment and if the comment was approved. | 
| 954 |  * @uses wp_filter_comment() Used to filter comment before adding comment. | 
| 955 |  * @uses wp_allow_comment() checks to see if comment is approved. | 
| 956 |  * @uses wp_insert_comment() Does the actual comment insertion to the database. | 
| 957 |  * | 
| 958 |  * @param array $commentdata Contains information on the comment. | 
| 959 |  * @return int The ID of the comment after adding. | 
| 960 |  */ | 
| 961 | function wp_new_comment( $commentdata ) { | 
| 962 |      $commentdata = apply_filters('preprocess_comment', $commentdata); | 
| 963 |  | 
| 964 |      $commentdata['comment_post_ID'] = (int) $commentdata['comment_post_ID']; | 
| 965 |      $commentdata['user_ID']         = (int) $commentdata['user_ID']; | 
| 966 |  | 
| 967 |      $commentdata['comment_parent'] = absint($commentdata['comment_parent']); | 
| 968 |      $parent_status = ( 0 < $commentdata['comment_parent'] ) ? wp_get_comment_status($commentdata['comment_parent']) : ''; | 
| 969 |      $commentdata['comment_parent'] = ( 'approved' == $parent_status || 'unapproved' == $parent_status ) ? $commentdata['comment_parent'] : 0; | 
| 970 |  | 
| 971 |      $commentdata['comment_author_IP'] = preg_replace( '/[^0-9a-fA-F:., ]/', '',$_SERVER['REMOTE_ADDR'] ); |