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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 |
|---|---|
| 226 | * @since 2.9.0 |
| 227 | * |
| 228 | * @see WP_Embed::shortcode() |
| 229 | * |
| 230 | * @param mixed $cache The cached HTML result, stored in post meta. |
| 231 | * @param string $url The attempted embed URL. |
| 232 | * @param array $attr An array of shortcode attributes. |
| 233 | * @param int $post_ID Post ID. |
| 234 | */ |
| 235 | return apply_filters( 'embed_oembed_html', $cache, $url, $attr, $post_ID ); |
| 236 | } |
| 237 | } |
| 238 | |
| 239 | /** |
| 240 | * Filter whether to inspect the given URL for discoverable <link> tags. |
| 241 | * |
| 242 | * @since 2.9.0 |
| 243 | * |
| 244 | * @see WP_oEmbed::discover() |
| Line | Code |
| 255 | update_post_meta( $post_ID, $cachekey, $html ); |
| 256 | update_post_meta( $post_ID, $cachekey_time, time() ); |
| 257 | } elseif ( ! $cache ) { |
| 258 | update_post_meta( $post_ID, $cachekey, '{{unknown}}' ); |
| 259 | } |
| 260 | |
| 261 | // If there was a result, return it |
| 262 | if ( $html ) { |
| 263 | /** This filter is documented in wp-includes/class-wp-embed.php */ |
| 264 | return apply_filters( 'embed_oembed_html', $html, $url, $attr, $post_ID ); |
| 265 | } |
| 266 | } |
| 267 | |
| 268 | // Still unknown |
| 269 | return $this->maybe_make_link( $url ); |
| 270 | } |
| 271 | |
| 272 | /** |
| 273 | * Delete all oEmbed caches. Unused by core as of 4.0.0. |