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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 |
|---|---|
| 534 | $feed->set_sanitize_class( 'WP_SimplePie_Sanitize_KSES' ); |
| 535 | // We must manually overwrite $feed->sanitize because SimplePie's |
| 536 | // constructor sets it before we have a chance to set the sanitization class |
| 537 | $feed->sanitize = new WP_SimplePie_Sanitize_KSES(); |
| 538 | |
| 539 | $feed->set_cache_class( 'WP_Feed_Cache' ); |
| 540 | $feed->set_file_class( 'WP_SimplePie_File' ); |
| 541 | |
| 542 | $feed->set_feed_url( $url ); |
| 543 | $feed->set_cache_duration( apply_filters( 'wp_feed_cache_transient_lifetime', 12 * HOUR_IN_SECONDS, $url ) ); |
| 544 | do_action_ref_array( 'wp_feed_options', array( &$feed, $url ) ); |
| 545 | $feed->init(); |
| 546 | $feed->handle_content_type(); |
| 547 | |
| 548 | if ( $feed->error() ) |
| 549 | return new WP_Error( 'simplepie-error', $feed->error() ); |
| 550 | |
| 551 | return $feed; |
| 552 | } |