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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 |
|---|---|
| 2574 | $r[ $post->ID ] = $post->post_parent; |
| 2575 | |
| 2576 | return $r; |
| 2577 | } |
| 2578 | |
| 2579 | $this->posts = $wpdb->get_results($this->request); |
| 2580 | |
| 2581 | // Raw results filter. Prior to status checks. |
| 2582 | if ( !$q['suppress_filters'] ) |
| 2583 | $this->posts = apply_filters_ref_array('posts_results', array( $this->posts, &$this ) ); |
| 2584 | |
| 2585 | if ( !empty($this->posts) && $this->is_comment_feed && $this->is_singular ) { |
| 2586 | $cjoin = apply_filters_ref_array('comment_feed_join', array( '', &$this ) ); |
| 2587 | $cwhere = apply_filters_ref_array('comment_feed_where', array( "WHERE comment_post_ID = '{$this->posts[0]->ID}' AND comment_approved = '1'", &$this ) ); |
| 2588 | $cgroupby = apply_filters_ref_array('comment_feed_groupby', array( '', &$this ) ); |
| 2589 | $cgroupby = ( ! empty( $cgroupby ) ) ? 'GROUP BY ' . $cgroupby : ''; |
| 2590 | $corderby = apply_filters_ref_array('comment_feed_orderby', array( 'comment_date_gmt DESC', &$this ) ); |
| 2591 | $corderby = ( ! empty( $corderby ) ) ? 'ORDER BY ' . $corderby : ''; |
| 2592 | $climits = apply_filters_ref_array('comment_feed_limits', array( 'LIMIT ' . get_option('posts_per_rss'), &$this ) ); |