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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 |
|---|---|
| 183 | * Filter the oEmbed TTL value (time to live). |
| 184 | * |
| 185 | * @since 4.0.0 |
| 186 | * |
| 187 | * @param int $time Time to live (in seconds). |
| 188 | * @param string $url The attempted embed URL. |
| 189 | * @param array $attr An array of shortcode attributes. |
| 190 | * @param int $post_ID Post ID. |
| 191 | */ |
| 192 | $ttl = apply_filters( 'oembed_ttl', DAY_IN_SECONDS, $url, $attr, $post_ID ); |
| 193 | |
| 194 | $cache = get_post_meta( $post_ID, $cachekey, true ); |
| 195 | $cache_time = get_post_meta( $post_ID, $cachekey_time, true ); |
| 196 | |
| 197 | if ( ! $cache_time ) { |
| 198 | $cache_time = 0; |
| 199 | } |
| 200 | |
| 201 | $cached_recently = ( time() - $cache_time ) < $ttl; |