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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 |
|---|---|
| 258 | * Filters whether to inspect the given URL for discoverable link tags. |
| 259 | * |
| 260 | * @since 2.9.0 |
| 261 | * @since 4.4.0 The default value changed to true. |
| 262 | * |
| 263 | * @see WP_oEmbed::discover() |
| 264 | * |
| 265 | * @param bool $enable Whether to enable `<link>` tag discovery. Default true. |
| 266 | */ |
| 267 | $attr['discover'] = apply_filters( 'embed_oembed_discover', true ); |
| 268 | |
| 269 | // Use oEmbed to get the HTML. |
| 270 | $html = wp_oembed_get( $url, $attr ); |
| 271 | |
| 272 | if ( $post_ID ) { |
| 273 | if ( $html ) { |
| 274 | update_post_meta( $post_ID, $cachekey, $html ); |
| 275 | update_post_meta( $post_ID, $cachekey_time, time() ); |
| 276 | } elseif ( ! $cache ) { |