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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.
This hook occurs 2 times in this file.
| Line | Code |
|---|---|
| 219 | * @since 2.9.0 |
| 220 | * |
| 221 | * @see WP_Embed::shortcode() |
| 222 | * |
| 223 | * @param mixed $cache The cached HTML result, stored in post meta. |
| 224 | * @param string $url The attempted embed URL. |
| 225 | * @param array $attr An array of shortcode attributes. |
| 226 | * @param int $post_ID Post ID. |
| 227 | */ |
| 228 | return apply_filters( 'embed_oembed_html', $cache, $url, $attr, $post_ID ); |
| 229 | } |
| 230 | } |
| 231 | |
| 232 | /** |
| 233 | * Filter whether to inspect the given URL for discoverable link tags. |
| 234 | * |
| 235 | * @since 2.9.0 |
| 236 | * @since 4.4.0 The default value changed to true. |
| 237 | * |
| Line | Code |
| 249 | update_post_meta( $post_ID, $cachekey, $html ); |
| 250 | update_post_meta( $post_ID, $cachekey_time, time() ); |
| 251 | } elseif ( ! $cache ) { |
| 252 | update_post_meta( $post_ID, $cachekey, '{{unknown}}' ); |
| 253 | } |
| 254 | |
| 255 | // If there was a result, return it |
| 256 | if ( $html ) { |
| 257 | /** This filter is documented in wp-includes/class-wp-embed.php */ |
| 258 | return apply_filters( 'embed_oembed_html', $html, $url, $attr, $post_ID ); |
| 259 | } |
| 260 | } |
| 261 | |
| 262 | // Still unknown |
| 263 | return $this->maybe_make_link( $url ); |
| 264 | } |
| 265 | |
| 266 | /** |
| 267 | * Delete all oEmbed caches. Unused by core as of 4.0.0. |