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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 |
|---|---|
| 294 | * Filters whether to inspect the given URL for discoverable link tags. |
| 295 | * |
| 296 | * @since 2.9.0 |
| 297 | * @since 4.4.0 The default value changed to true. |
| 298 | * |
| 299 | * @see WP_oEmbed::discover() |
| 300 | * |
| 301 | * @param bool $enable Whether to enable `<link>` tag discovery. Default true. |
| 302 | */ |
| 303 | $attr['discover'] = apply_filters( 'embed_oembed_discover', true ); |
| 304 | |
| 305 | // Use oEmbed to get the HTML. |
| 306 | $html = wp_oembed_get( $url, $attr ); |
| 307 | |
| 308 | if ( $post_id ) { |
| 309 | if ( $html ) { |
| 310 | update_post_meta( $post_id, $cachekey, $html ); |
| 311 | update_post_meta( $post_id, $cachekey_time, time() ); |
| 312 | } elseif ( ! $cache ) { |