WordPress Version: 6.1
/**
* Default filter attached to pingback_ping_source_uri to validate the pingback's Source URI.
*
* @since 3.5.1
*
* @see wp_http_validate_url()
*
* @param string $source_uri
* @return string
*/
function pingback_ping_source_uri($source_uri)
{
return (string) wp_http_validate_url($source_uri);
}