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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 |
|---|---|
| 528 | * @return WP_Error|SimplePie WP_Error object on failure or SimplePie object on success |
| 529 | */ |
| 530 | function fetch_feed($url) { |
| 531 | require_once (ABSPATH . WPINC . '/class-feed.php'); |
| 532 | |
| 533 | $feed = new SimplePie(); |
| 534 | $feed->set_feed_url($url); |
| 535 | $feed->set_cache_class('WP_Feed_Cache'); |
| 536 | $feed->set_file_class('WP_SimplePie_File'); |
| 537 | $feed->set_cache_duration(apply_filters('wp_feed_cache_transient_lifetime', 43200, $url)); |
| 538 | do_action_ref_array( 'wp_feed_options', array( &$feed, $url ) ); |
| 539 | $feed->init(); |
| 540 | $feed->handle_content_type(); |
| 541 | |
| 542 | if ( $feed->error() ) |
| 543 | return new WP_Error('simplepie-error', $feed->error()); |
| 544 | |
| 545 | return $feed; |
| 546 | } |