/**
	 * Build image element from given setting
	 *
	 * @param array  $attr Image options.
	 * @param string $image_size Image size.
	 * @param string $additional_id ID.
	 * @param string $additional_class Class.
	 * @param string $additional_alt Alt.
	 *
	 * @return string
	 */
	protected function render_image_element( $attr, $image_size = 'thumbnail', $additional_id = null, $additional_class = null, $additional_alt = null ) {
		$id         = ! empty( $additional_id ) ? ' id="' . $additional_id . '"' : '';
		$class      = ! empty( $additional_class ) ? ' class="' . $additional_class . '"' : '';
		$alt        = ! empty( $additional_alt ) ? ' alt="' . $additional_alt . '"' : ( isset( $attr['alt'] ) && ! empty( $attr['alt'] ) ? ' alt="' . $attr['alt'] . '"' : '' );
		$width      = ! empty( $attr['width'] ) ? ' width="' . $attr['width'] . '"' : '';
		$height     = ! empty( $attr['height'] ) ? ' height="' . $attr['height'] . '"' : '';
		$attachment = ! empty( $attr['id'] ) ? wp_get_attachment_image_src( $attr['id'], $image_size ) : '';
		$image      = ! empty( $attachment[0] ) ? '' : '';
		$image      = ! empty( $attr['url'] ) && empty( $image ) ? '' : $image;

		return $image;
	}