wp_oembed_ensure_format( string $format )

Ensures that the specified format is either ‘json’ or ‘xml’.

Parameters

$format

(string) (Required) The oEmbed response format. Accepts 'json' or 'xml'.

Return

(string) The format, either 'xml' or 'json'. Default 'json'.

Source

File: wp-includes/embed.php 

function wp_oembed_ensure_format( $format ) {
	if ( ! in_array( $format, array( 'json', 'xml' ), true ) ) {
		return 'json';
	}

	return $format;
}

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Changelog

Changelog
Version Description
WP-4.4.0 Introduced.