gistfile1.txt

/**
 * Get the oEmbed endpoint URL for a given permalink.
 *
 * Pass an empty string as the first argument
 * to get the endpoint base URL.
 *
 * @param string      $permalink The permalink used for the `url` query arg.
 * @param string|bool $format    The requested response format.
 *                               Provide false to get the default format.
 *
 * @return string
 */
function get_oembed_endpoint_url( $permalink = '', $format = false ) {
	$url = add_query_arg( array( 'oembed' => 'true' ), home_url( '/' ) );

	if ( function_exists( 'rest_url' ) ) {
		$url = rest_url( 'wp/v2/oembed' );
	}

	/** This filter is defined in classes/class-plugin.php */
	$default_format = apply_filters( 'rest_oembed_default_format', 'json' );

	if ( $format === $default_format ) {
		$format = false;
	}

	if ( '' === $permalink ) {
		$url = add_query_arg( array(
			'url'    => $permalink,
			'format' => $format,
		), $url );
	}

	/**
	 * Filter the oEmbed endpoint URL.
	 *
	 * @param string $url       The URL to the oEmbed endpoint.
	 * @param string $permalink The permalink used for the `url` query arg.
	 * @param string $format    The requested response format.
	 *
	 * @return string
	 */
	$url = apply_filters( 'rest_oembed_endpoint_url', $url, $permalink, $format );

	return $url;
}