Source

File: wp-includes/class-wp-oembed.php

private function _parse_xml( $response_body ) {
		if ( ! function_exists( 'libxml_disable_entity_loader' ) ) {
			return false;
		}

		$loader = libxml_disable_entity_loader( true );
		$errors = libxml_use_internal_errors( true );

		$return = $this->_parse_xml_body( $response_body );

		libxml_use_internal_errors( $errors );
		libxml_disable_entity_loader( $loader );

		return $return;
	}