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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 |
|---|---|
| 818 | |
| 819 | /** |
| 820 | * Fires just before processing the SimplePie feed object. |
| 821 | * |
| 822 | * @since 3.0.0 |
| 823 | * |
| 824 | * @param SimplePie $feed SimplePie feed object (passed by reference). |
| 825 | * @param string|string[] $url URL of feed or array of URLs of feeds to retrieve. |
| 826 | */ |
| 827 | do_action_ref_array( 'wp_feed_options', array( &$feed, $url ) ); |
| 828 | |
| 829 | $feed->init(); |
| 830 | $feed->set_output_encoding( get_option( 'blog_charset' ) ); |
| 831 | |
| 832 | if ( $feed->error() ) { |
| 833 | return new WP_Error( 'simplepie-error', $feed->error() ); |
| 834 | } |
| 835 | |
| 836 | return $feed; |