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Understanding Source Code

The best way to understand what a hook does is to look at where it occurs in the source code.

Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.

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Line Code
3272           if ( ! $q['suppress_filters'] ) {
3273                /**
3274                 * Filter the raw post results array, prior to status checks.
3275                 *
3276                 * @since 2.3.0
3277                 *
3278                 * @param array    $posts The post results array.
3279                 * @param WP_Query &$this The WP_Query instance (passed by reference).
3280                 */
3281                $this->posts = apply_filters_ref_array( 'posts_results', array( $this->posts, &$this ) );
3282           }
3283
3284           if ( !empty($this->posts) && $this->is_comment_feed && $this->is_singular ) {
3285                /** This filter is documented in wp-includes/query.php */
3286                $cjoin = apply_filters_ref_array( 'comment_feed_join', array( '', &$this ) );
3287
3288                /** This filter is documented in wp-includes/query.php */
3289                $cwhere = apply_filters_ref_array( 'comment_feed_where', array( "WHERE comment_post_ID = '{$this->posts[0]->ID}' AND comment_approved = '1'", &$this ) );
3290