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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 |
---|---|
627 | if ( $site && get_current_blog_id() !== (int) $site->blog_id ) { |
628 | switch_to_blog( $site->blog_id ); |
629 | $switched_blog = true; |
630 | } |
631 | } |
632 |
|
633 | $post_id = url_to_postid( $url ); |
634 |
|
635 | /** This filter is documented in wp-includes/class-wp-oembed-controller.php */ |
636 | $post_id = apply_filters( 'oembed_request_post_id', $post_id, $url ); |
637 |
|
638 | if ( ! $post_id ) { |
639 | if ( $switched_blog ) { |
640 | restore_current_blog(); |
641 | } |
642 |
|
643 | return false; |
644 | } |
645 |
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