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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 |
|---|---|
| 773 | $feed->set_cache_duration( apply_filters( 'wp_feed_cache_transient_lifetime', 12 * HOUR_IN_SECONDS, $url ) ); |
| 774 | /** |
| 775 | * Fires just before processing the SimplePie feed object. |
| 776 | * |
| 777 | * @since 3.0.0 |
| 778 | * |
| 779 | * @param SimplePie $feed SimplePie feed object (passed by reference). |
| 780 | * @param string|string[] $url URL of feed or array of URLs of feeds to retrieve. |
| 781 | */ |
| 782 | do_action_ref_array( 'wp_feed_options', array( &$feed, $url ) ); |
| 783 | $feed->init(); |
| 784 | $feed->set_output_encoding( get_option( 'blog_charset' ) ); |
| 785 | |
| 786 | if ( $feed->error() ) { |
| 787 | return new WP_Error( 'simplepie-error', $feed->error() ); |
| 788 | } |
| 789 | |
| 790 | return $feed; |
| 791 | } |