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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 |
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636 | $feed->set_cache_duration( apply_filters( 'wp_feed_cache_transient_lifetime', 12 * HOUR_IN_SECONDS, $url ) ); |
637 | /** |
638 | * Fires just before processing the SimplePie feed object. |
639 | * |
640 | * @since 3.0.0 |
641 | * |
642 | * @param object &$feed SimplePie feed object, passed by reference. |
643 | * @param mixed $url URL of feed to retrieve. If an array of URLs, the feeds are merged. |
644 | */ |
645 | do_action_ref_array( 'wp_feed_options', array( &$feed, $url ) ); |
646 | $feed->init(); |
647 | $feed->handle_content_type(); |
648 |
|
649 | if ( $feed->error() ) |
650 | return new WP_Error( 'simplepie-error', $feed->error() ); |
651 |
|
652 | return $feed; |
653 | } |
654 |
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