apply_filters( ‘post_gallery’, string $output, array $attr, int $instance )

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   Steven Lin 4 years ago

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   Example Migrated from Codex:

   Hook into the gallery shortcode and replace its output with your own.

   add_filter( 'post_gallery', 'my_gallery_shortcode', 10, 3 );
   
   function my_gallery_shortcode( $output = '', $atts = null, $instance = null ) {
   	$return = $output; // fallback
   
   	// retrieve content of your own gallery function
   	$my_result = get_my_gallery_content( $atts );
   
   	// boolean false = empty, see http://php.net/empty
   	if( !empty( $my_result ) ) {
   		$return = $my_result;
   	}
   
   	return $return;
   }