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

2509	 * @see img_caption_shortcode()2510	 *2511	 * @param string $output  The caption output. Default empty.2512	 * @param array  $attr    Attributes of the caption shortcode.2513	 * @param string $content The image element, possibly wrapped in a hyperlink.2514	 */2515	$output = apply_filters( 'img_caption_shortcode', '', $attr, $content );2516 2517	if ( ! empty( $output ) ) {2518		return $output;2519	}2520 2521	$atts = shortcode_atts(