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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 |
|---|---|
| 617 | if ( $site && get_current_blog_id() !== (int) $site->blog_id ) { |
| 618 | switch_to_blog( $site->blog_id ); |
| 619 | $switched_blog = true; |
| 620 | } |
| 621 | } |
| 622 | |
| 623 | $post_id = url_to_postid( $url ); |
| 624 | |
| 625 | /** This filter is documented in wp-includes/class-wp-oembed-controller.php */ |
| 626 | $post_id = apply_filters( 'oembed_request_post_id', $post_id, $url ); |
| 627 | |
| 628 | if ( ! $post_id ) { |
| 629 | if ( $switched_blog ) { |
| 630 | restore_current_blog(); |
| 631 | } |
| 632 | |
| 633 | return false; |
| 634 | } |
| 635 | |