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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 |
|---|---|
| 1750 | $prefiltered_user_id = ( isset( $commentdata['user_id'] ) ) ? (int) $commentdata['user_id'] : 0; |
| 1751 | |
| 1752 | /** |
| 1753 | * Filters a comment's data before it is sanitized and inserted into the database. |
| 1754 | * |
| 1755 | * @since 1.5.0 |
| 1756 | * |
| 1757 | * @param array $commentdata Comment data. |
| 1758 | */ |
| 1759 | $commentdata = apply_filters( 'preprocess_comment', $commentdata ); |
| 1760 | |
| 1761 | $commentdata['comment_post_ID'] = (int) $commentdata['comment_post_ID']; |
| 1762 | if ( isset( $commentdata['user_ID'] ) && $prefiltered_user_id !== (int) $commentdata['user_ID'] ) { |
| 1763 | $commentdata['user_id'] = $commentdata['user_ID'] = (int) $commentdata['user_ID']; |
| 1764 | } elseif ( isset( $commentdata['user_id'] ) ) { |
| 1765 | $commentdata['user_id'] = (int) $commentdata['user_id']; |
| 1766 | } |
| 1767 | |
| 1768 | $commentdata['comment_parent'] = isset($commentdata['comment_parent']) ? absint($commentdata['comment_parent']) : 0; |