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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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693 | $feed->set_cache_duration( apply_filters( 'wp_feed_cache_transient_lifetime', 12 * HOUR_IN_SECONDS, $url ) ); |
694 | /** |
695 | * Fires just before processing the SimplePie feed object. |
696 | * |
697 | * @since 3.0.0 |
698 | * |
699 | * @param object $feed SimplePie feed object (passed by reference). |
700 | * @param mixed $url URL of feed to retrieve. If an array of URLs, the feeds are merged. |
701 | */ |
702 | do_action_ref_array( 'wp_feed_options', array( &$feed, $url ) ); |
703 | $feed->init(); |
704 | $feed->set_output_encoding( get_option( 'blog_charset' ) ); |
705 |
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706 | if ( $feed->error() ) |
707 | return new WP_Error( 'simplepie-error', $feed->error() ); |
708 |
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709 | return $feed; |
710 | } |
711 |
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