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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.
This hook occurs 2 times in this file.
| Line | Code |
|---|---|
| 3235 | if ( !$q['suppress_filters'] ) { |
| 3236 | /** |
| 3237 | * Filter the JOIN clause of the comments feed query before sending. |
| 3238 | * |
| 3239 | * @since 2.2.0 |
| 3240 | * |
| 3241 | * @param string $cjoin The JOIN clause of the query. |
| 3242 | * @param WP_Query &$this The WP_Query instance (passed by reference). |
| 3243 | */ |
| 3244 | $cjoin = apply_filters_ref_array( 'comment_feed_join', array( $cjoin, &$this ) ); |
| 3245 | |
| 3246 | /** |
| 3247 | * Filter the WHERE clause of the comments feed query before sending. |
| 3248 | * |
| 3249 | * @since 2.2.0 |
| 3250 | * |
| 3251 | * @param string $cwhere The WHERE clause of the query. |
| 3252 | * @param WP_Query &$this The WP_Query instance (passed by reference). |
| 3253 | */ |
| Line | Code |
| 3641 | * |
| 3642 | * @param array $posts The post results array. |
| 3643 | * @param WP_Query &$this The WP_Query instance (passed by reference). |
| 3644 | */ |
| 3645 | $this->posts = apply_filters_ref_array( 'posts_results', array( $this->posts, &$this ) ); |
| 3646 | } |
| 3647 | |
| 3648 | if ( !empty($this->posts) && $this->is_comment_feed && $this->is_singular ) { |
| 3649 | /** This filter is documented in wp-includes/query.php */ |
| 3650 | $cjoin = apply_filters_ref_array( 'comment_feed_join', array( '', &$this ) ); |
| 3651 | |
| 3652 | /** This filter is documented in wp-includes/query.php */ |
| 3653 | $cwhere = apply_filters_ref_array( 'comment_feed_where', array( "WHERE comment_post_ID = '{$this->posts[0]->ID}' AND comment_approved = '1'", &$this ) ); |
| 3654 | |
| 3655 | /** This filter is documented in wp-includes/query.php */ |
| 3656 | $cgroupby = apply_filters_ref_array( 'comment_feed_groupby', array( '', &$this ) ); |
| 3657 | $cgroupby = ( ! empty( $cgroupby ) ) ? 'GROUP BY ' . $cgroupby : ''; |
| 3658 | |
| 3659 | /** This filter is documented in wp-includes/query.php */ |