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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 |
|---|---|
| 3428 | if ( $this->is_preview && $this->posts && current_user_can( $edit_cap, $this->posts[0]->ID ) ) { |
| 3429 | /** |
| 3430 | * Filters the single post for preview mode. |
| 3431 | * |
| 3432 | * @since 2.7.0 |
| 3433 | * |
| 3434 | * @param WP_Post $post_preview The Post object. |
| 3435 | * @param WP_Query $query The WP_Query instance (passed by reference). |
| 3436 | */ |
| 3437 | $this->posts[0] = get_post( apply_filters_ref_array( 'the_preview', array( $this->posts[0], &$this ) ) ); |
| 3438 | } |
| 3439 | } |
| 3440 | |
| 3441 | // Put sticky posts at the top of the posts array. |
| 3442 | $sticky_posts = get_option( 'sticky_posts' ); |
| 3443 | if ( $this->is_home && $page <= 1 && is_array( $sticky_posts ) && ! empty( $sticky_posts ) && ! $q['ignore_sticky_posts'] ) { |
| 3444 | $num_posts = count( $this->posts ); |
| 3445 | $sticky_offset = 0; |
| 3446 | // Loop over posts and relocate stickies to the front. |