apply_filters( 'img_caption_shortcode', string $output, array $attr, string $content )

2647	 * @see img_caption_shortcode()2648	 *2649	 * @param string $output  The caption output. Default empty.2650	 * @param array  $attr    Attributes of the caption shortcode.2651	 * @param string $content The image element, possibly wrapped in a hyperlink.2652	 */2653	$output = apply_filters( 'img_caption_shortcode', '', $attr, $content );2654 2655	if ( ! empty( $output ) ) {2656		return $output;2657	}2658 2659	/**