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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 |
|---|---|
| 1515 | |
| 1516 | // Merge old and new fields with new fields overwriting old ones. |
| 1517 | $commentarr = array_merge($comment, $commentarr); |
| 1518 | |
| 1519 | $commentarr = wp_filter_comment( $commentarr ); |
| 1520 | |
| 1521 | // Now extract the merged array. |
| 1522 | extract(wp_unslash($commentarr), EXTR_SKIP); |
| 1523 | |
| 1524 | $comment_content = apply_filters('comment_save_pre', $comment_content); |
| 1525 | |
| 1526 | $comment_date_gmt = get_gmt_from_date($comment_date); |
| 1527 | |
| 1528 | if ( !isset($comment_approved) ) |
| 1529 | $comment_approved = 1; |
| 1530 | else if ( 'hold' == $comment_approved ) |
| 1531 | $comment_approved = 0; |
| 1532 | else if ( 'approve' == $comment_approved ) |
| 1533 | $comment_approved = 1; |