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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 |
|---|---|
| 672 | $feed->set_cache_duration( apply_filters( 'wp_feed_cache_transient_lifetime', 12 * HOUR_IN_SECONDS, $url ) ); |
| 673 | /** |
| 674 | * Fires just before processing the SimplePie feed object. |
| 675 | * |
| 676 | * @since 3.0.0 |
| 677 | * |
| 678 | * @param object &$feed SimplePie feed object, passed by reference. |
| 679 | * @param mixed $url URL of feed to retrieve. If an array of URLs, the feeds are merged. |
| 680 | */ |
| 681 | do_action_ref_array( 'wp_feed_options', array( &$feed, $url ) ); |
| 682 | $feed->init(); |
| 683 | $feed->set_output_encoding( get_option( 'blog_charset' ) ); |
| 684 | $feed->handle_content_type(); |
| 685 | |
| 686 | if ( $feed->error() ) |
| 687 | return new WP_Error( 'simplepie-error', $feed->error() ); |
| 688 | |
| 689 | return $feed; |
| 690 | } |