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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 |
|---|---|
| 819 | // Back-compat for SimplePie 1.2.x. |
| 820 | require_once ABSPATH . WPINC . '/class-wp-feed-cache.php'; |
| 821 | $feed->set_cache_class( 'WP_Feed_Cache' ); |
| 822 | } |
| 823 | |
| 824 | $feed->set_file_class( 'WP_SimplePie_File' ); |
| 825 | |
| 826 | $feed->set_feed_url( $url ); |
| 827 | /** This filter is documented in wp-includes/class-wp-feed-cache-transient.php */ |
| 828 | $feed->set_cache_duration( apply_filters( 'wp_feed_cache_transient_lifetime', 12 * HOUR_IN_SECONDS, $url ) ); |
| 829 | |
| 830 | /** |
| 831 | * Fires just before processing the SimplePie feed object. |
| 832 | * |
| 833 | * @since 3.0.0 |
| 834 | * |
| 835 | * @param SimplePie $feed SimplePie feed object (passed by reference). |
| 836 | * @param string|string[] $url URL of feed or array of URLs of feeds to retrieve. |
| 837 | */ |