Fragment Cache is a WordPress plugin for partial and async caching of heavy front-end elements. It currently supports caching navigation menus, widgets, and galleries.

Caching is built on top of transients API (with enhancements provided by TLC Transients library), provides soft expiration and transparent object cache support.

Fragment Cache is a Composer package and can be installed in plugin directory via:

composer create-project rarst/fragment-cache --no-dev

Fragment Cache implements soft expiration - when fragments expire, they are regenerated asynchronously and do not take time in front end page load. The side effect is that it is impossible to preserve context precisely and in generic way.

Fragments that must be aware of users or other context information should be excluded from caching or handled by custom implementation, that properly handles that specific context.

Caching for the fragment type can be disabled by manipulating main plugin object:

global $fragment_cache;

// completely remove handler, only use before init
unset( $fragment_cache['widget'] );

// or disable handler, use after init
$fragment_cache['widget']->disable();

Caching for individual fragments can be disabled by using fc_skip_cache hook, for example:

add_filter( 'fc_skip_cache', function ( $skip, $type, $name, $args, $salt ) {

	if ( 'widget' == $type && is_a( $args['callback'][0], 'WP_Widget_Meta' ) )
		return true;

	return $skip;
}, 10, 5 );

• added Update Blocker support

• anonymized fragment generation in front end for consistency
• added fc_skip_cache filter to disable cache for individual fragments
• updated documentation

• initial release

Fragment Cache own code is licensed under GPLv2+ and it makes use of code from:

• Composer (MIT)
• Pimple (MIT)
• TLC Transients (GPLv2+)