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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 |
|---|---|
| 922 | * @uses apply_filters() Calls 'pre_comment_author_email' hook on comment author's email address |
| 923 | * |
| 924 | * @param array $commentdata Contains information on the comment. |
| 925 | * @return array Parsed comment information. |
| 926 | */ |
| 927 | function wp_filter_comment($commentdata) { |
| 928 | $commentdata['user_id'] = apply_filters('pre_user_id', $commentdata['user_ID']); |
| 929 | $commentdata['comment_agent'] = apply_filters('pre_comment_user_agent', $commentdata['comment_agent']); |
| 930 | $commentdata['comment_author'] = apply_filters('pre_comment_author_name', $commentdata['comment_author']); |
| 931 | $commentdata['comment_content'] = apply_filters('pre_comment_content', $commentdata['comment_content']); |
| 932 | $commentdata['comment_author_IP'] = apply_filters('pre_comment_user_ip', $commentdata['comment_author_IP']); |
| 933 | $commentdata['comment_author_url'] = apply_filters('pre_comment_author_url', $commentdata['comment_author_url']); |
| 934 | $commentdata['comment_author_email'] = apply_filters('pre_comment_author_email', $commentdata['comment_author_email']); |
| 935 | $commentdata['filtered'] = true; |
| 936 | return $commentdata; |
| 937 | } |
| 938 | |
| 939 | /** |
| 940 | * Whether comment should be blocked because of comment flood. |