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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 |
|---|---|
| 280 | * @since 2.9.0 |
| 281 | * |
| 282 | * @see WP_Embed::shortcode() |
| 283 | * |
| 284 | * @param string|false $cache The cached HTML result, stored in post meta. |
| 285 | * @param string $url The attempted embed URL. |
| 286 | * @param array $attr An array of shortcode attributes. |
| 287 | * @param int $post_id Post ID. |
| 288 | */ |
| 289 | return apply_filters( 'embed_oembed_html', $cache, $url, $attr, $post_id ); |
| 290 | } |
| 291 | } |
| 292 | |
| 293 | /** |
| 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 | * |
| Line | Code |
| 363 | |
| 364 | if ( $has_kses ) { |
| 365 | kses_init_filters(); |
| 366 | } |
| 367 | } |
| 368 | |
| 369 | // If there was a result, return it. |
| 370 | if ( $html ) { |
| 371 | /** This filter is documented in wp-includes/class-wp-embed.php */ |
| 372 | return apply_filters( 'embed_oembed_html', $html, $url, $attr, $post_id ); |
| 373 | } |
| 374 | |
| 375 | // Still unknown. |
| 376 | return $this->maybe_make_link( $url ); |
| 377 | } |
| 378 | |
| 379 | /** |
| 380 | * Deletes all oEmbed caches. Unused by core as of 4.0.0. |
| 381 | * |