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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 |
|---|---|
| 396 | /** |
| 397 | * Filter the oEmbed URL to be fetched. |
| 398 | * |
| 399 | * @since 2.9.0 |
| 400 | * |
| 401 | * @param string $provider URL of the oEmbed provider. |
| 402 | * @param string $url URL of the content to be embedded. |
| 403 | * @param array $args Optional arguments, usually passed from a shortcode. |
| 404 | */ |
| 405 | $provider = apply_filters( 'oembed_fetch_url', $provider, $url, $args ); |
| 406 | |
| 407 | foreach( array( 'json', 'xml' ) as $format ) { |
| 408 | $result = $this->_fetch_with_format( $provider, $format ); |
| 409 | if ( is_wp_error( $result ) && 'not-implemented' == $result->get_error_code() ) |
| 410 | continue; |
| 411 | return ( $result && ! is_wp_error( $result ) ) ? $result : false; |
| 412 | } |
| 413 | return false; |
| 414 | } |