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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 |
|---|---|
| 669 | // We must manually overwrite $feed->sanitize because SimplePie's |
| 670 | // constructor sets it before we have a chance to set the sanitization class |
| 671 | $feed->sanitize = new WP_SimplePie_Sanitize_KSES(); |
| 672 | |
| 673 | $feed->set_cache_class( 'WP_Feed_Cache' ); |
| 674 | $feed->set_file_class( 'WP_SimplePie_File' ); |
| 675 | |
| 676 | $feed->set_feed_url( $url ); |
| 677 | /** This filter is documented in wp-includes/class-feed.php */ |
| 678 | $feed->set_cache_duration( apply_filters( 'wp_feed_cache_transient_lifetime', 12 * HOUR_IN_SECONDS, $url ) ); |
| 679 | /** |
| 680 | * Fires just before processing the SimplePie feed object. |
| 681 | * |
| 682 | * @since 3.0.0 |
| 683 | * |
| 684 | * @param object &$feed SimplePie feed object, passed by reference. |
| 685 | * @param mixed $url URL of feed to retrieve. If an array of URLs, the feeds are merged. |
| 686 | */ |
| 687 | do_action_ref_array( 'wp_feed_options', array( &$feed, $url ) ); |