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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 | 
|---|---|
| 341 |            * Passing a non-null value to the filter will effectively short-circuit retrieval, | 
| 342 |            * returning the passed value instead. | 
| 343 |            * | 
| 344 |            * @since 4.5.3 | 
| 345 |            * | 
| 346 |            * @param null|string $result The UNSANITIZED (and potentially unsafe) HTML that should be used to embed. Default null. | 
| 347 |            * @param string      $url    The URL to the content that should be attempted to be embedded. | 
| 348 |            * @param array       $args   Optional. Arguments, usually passed from a shortcode. Default empty. | 
| 349 |            */ | 
| 350 |           $pre = apply_filters( 'pre_oembed_result', null, $url, $args ); | 
| 351 |  | 
| 352 |           if ( null !== $pre ) { | 
| 353 |                return $pre; | 
| 354 |           } | 
| 355 |  | 
| 356 |           $provider = $this->get_provider( $url, $args ); | 
| 357 |  | 
| 358 |           if ( ! $provider || false === $data = $this->fetch( $provider, $url, $args ) ) { | 
| 359 |                return false; |