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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 |
|---|---|
| 201 | * Filters the oEmbed TTL value (time to live). |
| 202 | * |
| 203 | * @since 4.0.0 |
| 204 | * |
| 205 | * @param int $time Time to live (in seconds). |
| 206 | * @param string $url The attempted embed URL. |
| 207 | * @param array $attr An array of shortcode attributes. |
| 208 | * @param int $post_ID Post ID. |
| 209 | */ |
| 210 | $ttl = apply_filters( 'oembed_ttl', DAY_IN_SECONDS, $url, $attr, $post_ID ); |
| 211 | |
| 212 | $cache = get_post_meta( $post_ID, $cachekey, true ); |
| 213 | $cache_time = get_post_meta( $post_ID, $cachekey_time, true ); |
| 214 | |
| 215 | if ( ! $cache_time ) { |
| 216 | $cache_time = 0; |
| 217 | } |
| 218 | |
| 219 | $cached_recently = ( time() - $cache_time ) < $ttl; |