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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 |
|---|---|
| 27 | $lifetime = $this->lifetime; |
| 28 | /** |
| 29 | * Filter the transient lifetime of the feed cache. |
| 30 | * |
| 31 | * @since 2.8.0 |
| 32 | * |
| 33 | * @param int $lifetime Cache duration in seconds. Default is 43200 seconds (12 hours). |
| 34 | * @param string $filename Unique identifier for the cache object. |
| 35 | */ |
| 36 | $this->lifetime = apply_filters( 'wp_feed_cache_transient_lifetime', $lifetime, $filename); |
| 37 | } |
| 38 | |
| 39 | /** |
| 40 | * @access public |
| 41 | */ |
| 42 | public function save($data) { |
| 43 | if ( $data instanceof SimplePie ) { |
| 44 | $data = $data->data; |
| 45 | } |