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                <?php
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                namespace Rarst\Fragment_Cache;
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                /**
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                 * Cache galleries.
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                 */
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                class Gallery_Cache extends Fragment_Cache {
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                	/** @var mixed $original_shortcode Callback originally registered for gallery shortcode. */
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                	protected $original_shortcode;
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                	/**
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                	 * @inheritDoc
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                	 */
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                	public function enable() {
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                		global $shortcode_tags;
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                		if ( isset( $shortcode_tags['gallery'] ) ) {
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                			$this->original_shortcode = $shortcode_tags['gallery'];
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                		}
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                		add_shortcode( 'gallery', array( $this, 'gallery_shortcode' ) );
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                	}
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                	/**
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                	 * @inheritDoc
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                	 */
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                	public function disable() {
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                		if ( ! empty( $this->original_shortcode ) ) {
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                			add_shortcode( 'gallery', $this->original_shortcode );
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                		}
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                	}
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                	/**
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                	 * Fetch and return cached gallery.
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                	 *
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                	 * @param array $args Gallery arguments.
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                	 *
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                	 * @return string
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                	 */
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                	public function gallery_shortcode( $args ) {
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                		if ( empty( $args ) ) {
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                			$args = array();
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                		}
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                		// Salt for cases post edited or attachments changed.
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                		$args['fc_post_modified']    = get_the_modified_time( 'U' );
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                		$args['fc_post_attachments'] = $this->get_attachment_ids();
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                		$post_id = get_the_ID();
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                		$output  = $this->fetch( 'post-' . $post_id, compact( 'args', 'post_id' ), $args );
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                		return $output;
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                	}
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                	/**
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                	 * Retrieve array of attachment IDs for current post.
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                	 *
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                	 * @return array
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                	 */
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                	public function get_attachment_ids() {
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                		static $attachments = array();
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                		$post_id = get_the_ID();
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                		if ( ! isset( $attachments[ $post_id ] ) ) {
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                			$attachments[ $post_id ] = get_posts( array(
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                				'post_type'   => 'attachment',
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                				'post_parent' => $post_id,
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                				'orderby'     => 'ID',
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                				'fields'      => 'ids',
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                			) );
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                		}
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                		return $attachments[ $post_id ];
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                	}
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                	/**
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                	 * Set up post context and generate gallery output.
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                	 *
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                	 * @param string $name Fragment name.
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                	 * @param array  $args Arguments.
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                	 *
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                	 * @return string
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                	 */
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                	protected function callback( $name, $args ) {
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                		global $post;
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                		$post = get_post( $args['post_id'] );
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                		setup_postdata( $post );
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                		$shortcode = isset( $this->original_shortcode ) ? $this->original_shortcode : 'gallery_shortcode';
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                		$output    = call_user_func( $shortcode, $args['args'] ) . $this->get_comment( $name );
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                		wp_reset_postdata();
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                		return $output;
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                	}
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                }
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Instead of relying on
globalstate, we recommend one of these alternatives:1. Pass all data via parameters
2. Create a class that maintains your state