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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 |
|---|---|
| 592 | if ( $site && (int) $site->blog_id !== get_current_blog_id() ) { |
| 593 | switch_to_blog( $site->blog_id ); |
| 594 | $switched_blog = true; |
| 595 | } |
| 596 | } |
| 597 | |
| 598 | $post_id = url_to_postid( $url ); |
| 599 | |
| 600 | /** This filter is documented in wp-includes/class-wp-oembed-controller.php */ |
| 601 | $post_id = apply_filters( 'oembed_request_post_id', $post_id, $url ); |
| 602 | |
| 603 | if ( ! $post_id ) { |
| 604 | if ( $switched_blog ) { |
| 605 | restore_current_blog(); |
| 606 | } |
| 607 | |
| 608 | return false; |
| 609 | } |
| 610 | |