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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 |
|---|---|
| 3709 | if ( $this->is_preview && $this->posts && current_user_can( $edit_cap, $this->posts[0]->ID ) ) { |
| 3710 | /** |
| 3711 | * Filter the single post for preview mode. |
| 3712 | * |
| 3713 | * @since 2.7.0 |
| 3714 | * |
| 3715 | * @param WP_Post $post_preview The Post object. |
| 3716 | * @param WP_Query &$this The WP_Query instance (passed by reference). |
| 3717 | */ |
| 3718 | $this->posts[0] = get_post( apply_filters_ref_array( 'the_preview', array( $this->posts[0], &$this ) ) ); |
| 3719 | } |
| 3720 | } |
| 3721 | |
| 3722 | // Put sticky posts at the top of the posts array |
| 3723 | $sticky_posts = get_option('sticky_posts'); |
| 3724 | if ( $this->is_home && $page <= 1 && is_array($sticky_posts) && !empty($sticky_posts) && !$q['ignore_sticky_posts'] ) { |
| 3725 | $num_posts = count($this->posts); |
| 3726 | $sticky_offset = 0; |
| 3727 | // Loop over posts and relocate stickies to the front. |