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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 |
|---|---|
| 542 | * |
| 543 | * @since 2.9.0 |
| 544 | * @since 4.9.0 The `dnt` (Do Not Track) query parameter was added to all oEmbed provider URLs. |
| 545 | * |
| 546 | * @param string $provider URL of the oEmbed provider. |
| 547 | * @param string $url URL of the content to be embedded. |
| 548 | * @param array $args Optional. Additional arguments for retrieving embed HTML. |
| 549 | * See wp_oembed_get() for accepted arguments. Default empty. |
| 550 | */ |
| 551 | $provider = apply_filters( 'oembed_fetch_url', $provider, $url, $args ); |
| 552 | |
| 553 | foreach ( array( 'json', 'xml' ) as $format ) { |
| 554 | $result = $this->_fetch_with_format( $provider, $format ); |
| 555 | if ( is_wp_error( $result ) && 'not-implemented' === $result->get_error_code() ) { |
| 556 | continue; |
| 557 | } |
| 558 | |
| 559 | return ( $result && ! is_wp_error( $result ) ) ? $result : false; |
| 560 | } |