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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 |
|---|---|
| 3539 | if ( $this->is_preview && $this->posts && current_user_can( $edit_cap, $this->posts[0]->ID ) ) { |
| 3540 | /** |
| 3541 | * Filter the single post for preview mode. |
| 3542 | * |
| 3543 | * @since 2.7.0 |
| 3544 | * |
| 3545 | * @param WP_Post $post_preview The Post object. |
| 3546 | * @param WP_Query &$this The WP_Query instance (passed by reference). |
| 3547 | */ |
| 3548 | $this->posts[0] = get_post( apply_filters_ref_array( 'the_preview', array( $this->posts[0], &$this ) ) ); |
| 3549 | } |
| 3550 | } |
| 3551 | |
| 3552 | // Put sticky posts at the top of the posts array |
| 3553 | $sticky_posts = get_option('sticky_posts'); |
| 3554 | if ( $this->is_home && $page <= 1 && is_array($sticky_posts) && !empty($sticky_posts) && !$q['ignore_sticky_posts'] ) { |
| 3555 | $num_posts = count($this->posts); |
| 3556 | $sticky_offset = 0; |
| 3557 | // Loop over posts and relocate stickies to the front. |