v160521

• Bug Fix: Fixed a bug that, in some scenarios, resulted in "PHP Fatal error: Undefined class constant 'CACHE_PATH_NO_PATH_INDEX'". This also affected the Cache Statistics feature (Comet Cache Pro), resulting in a blank panel when hovering over the Cache Stats button in the menu bar. See Issue #752.
• Bug Fix: When the PHP OPCache extension is active, the OPCache is now cleared when a WordPress plugin is upgraded, activated, or deactivated. This works around an issue that could produce a fatal error when the PHP OPCache contains cached PHP code that conflicts with new PHP code introduced by an update. See Issue #740.
• Enhancement (Pro): It's now possible to disable the WordPress Admin Toolbar when Logged-In User Caching is enabled with a new option in Comet Cache → Plugin Options → Logged-In Users → Disable the Admin Toolbar for Logged-In Users & Comment Authors? Props @renzms and @KTS915. See Issue #690.
• Enhancement: The the option to automatically clear the cache for Custom Term Archive Views (see Comet Cache → Plugin Options → Automatic Cache Clearing → Auto-Clear "Custom Term Archives" Too?) is now enabled by default. This feature was previously disabled by default, which lead to confusion about why those cache files were not being cleared automatically when a Custom Post Type with a Custom Term Archive View was being used. Props @renzms. See Issue #693.
• Enhancement (Pro): A new filter allows overriding the default behavior to clear the user cache upon login and logout when caching for Logged-In Users is enabled. See this article for details. Props @KTS915. See Issue #756.

v160514-RC (Release Candidate)

• Bug Fix: Fixed a bug that, in some scenarios, resulted in "PHP Fatal error: Undefined class constant 'CACHE_PATH_NO_PATH_INDEX'". This also affected the Cache Statistics feature, resulting in a blank panel when hovering over the Cache Stats button in the menu bar. See Issue #752.
• Bug Fix: When the PHP OPCache extension is active, the OPCache is now cleared when a WordPress plugin is upgraded, activated, or deactivated. This works around an issue that could produce a fatal error when the PHP OPCache contains cached PHP code that conflicts with new PHP code introduced by an update. See Issue #740.
• Bug Fix (Pro): The WordPress Admin Toolbar was not being automatically disabled when Logged-In User Caching was enabled, which was preventing Logged-In User caching from working as expected on the front-end of the site due to the presence of Nonce values in the page source (Nonce values are generally NOT cache-compatible; see this article for details.) Props @renzms. See Issue #690.
• Enhancement (Pro): It's now possible to enable the WordPress Admin Toolbar when Logged-In User Caching is enabled with a new option in Comet Cache → Plugin Options → Logged-In Users → Enable the Admin Toolbar for Logged-In Users & Comment Authors? Props @renzms. See Issue #690.
• Enhancement: The the option to automatically clear the cache for Custom Term Archive Views (see Comet Cache → Plugin Options → Automatic Cache Clearing → Auto-Clear "Custom Term Archives" Too?) is now enabled by default. This feature was previously disabled by default, which lead to confusion about why those cache files were not being cleared automatically when a Custom Post Type with a Custom Term Archive View was being used. Props @renzms. See Issue #693.
• Enhancement (Pro): A new filter allows overriding the default behavior to clear the user cache upon login and logout when caching for Logged-In Users is enabled. See this article for details. Props @KTS915. See Issue #756.

v160417

• Bug Fix: Fixed a "PHP Fatal error: Undefined class constant 'CACHE_PATH_NO_SCHEME'" introduced by the previous release (v160416). This issue only affected sites where Feed Caching was enabled (Comet Cache → Plugin Options → RSS, RDF, and Atom Feeds). Props to MassimoD and @emanwebdev for reporting. See Issue #739.

v160416

• Enhancement: Several PHP 5.4+ enhancements, most notably a conversion from PHP Closures to PHP Traits. See Issue #635.
• Enhancement: Dashboard notices generated by Comet Cache now use the WordPress-style dismiss button to keep things consistent. See Issue #719.
• Enhancement: Dashboard notices generated by Comet Cache are now compacted into a single notice that can be expanded to view details. This helps reduce the number of messages that appear when, for example, a Post is published or updated and several cache files are automatically cleared. Instead of showing a separate notice for each type of cache file that was cleared, a single notice is shown with a link to toggle the details. See Issue #118.
• Enhancement (Pro): Improved the way the Auto-Cache Engine figures out the URL scheme (http vs https) that should be used when fetching the XML Sitemap. Instead of forcing http, whatever scheme is configured with the Home URL is now used. See Issue #715.
• Enhancement (Pro): The Pro Plugin Updater page now includes a "Save All Changes" button at the bottom, allowing you to save changes to the updater configuration without actually running the plugin updater. Props @bridgeport @NoahjChampion @1wdtv. See Issue #681.
• Bug Fix: Fixed a duplicated row of links on the Pro Plugin Updater page. See Issue #696.
• Bug Fix: Fixed an issue where some browsers would report "Failed to parse SourceMap" errors in their console when browsing the Comet Cache Options page. This was related to sourceMappingURL comments in the minified JS/CSS files that were intended for development purposes. Props to @1wdtv for reporting. See #732.
• Bug Fix: Fixed a UI bug in the Pro Preview that was causing the Manual Cache Clearing panel to not appear as part of the Pro Preview. Props @renzms. See Issue #711.
• Bug Fix (Pro): Fixed a bug related to the Pro Updater where some users who had migrated from ZenCache Pro to Comet Cache Pro were seeing an invalid new version message. Props @renzms @jaswsinc. See Issue #727
• Bug Fix (Pro): Fixed a bug with the Pro Plugin Updater that resulted in "Unknown error. Please wait 15 minutes and try again." when attempting to update Comet Cache Pro. The issue affected sites on servers running an old version of cURL (< v7.36) and/or an old version of OpenSSL, which made them unable to connect to the Comet Cache Pro update server. The Pro Plugin Updater now attempts to connect to a secondary update server that is more compatible with older versions of cURL and OpenSSL. See Issue #678.
• Hooks/Filters: Comet Cache now hooks into plugins_loaded instead of after_setup_theme when calling its own setup routine. This improves integration with other plugins that may be expecting the Comet Cache API functions to be available after plugins_loaded. Props to Frank Goossens (@futtta) from Autoptimize for helping with this. See Issue #716.
• Compatibility: Fixed a compatibility issue for some themes and plugins that were using old AC Plugin code designed to work with Quick Cache. This fix adds some backwards compatibility support for Quick Cache, but note that the first release of Comet Cache dropped support for Quick Cache backwards compatibility in favor of ZenCache backwards compatibility. See Issue #710.
• Compatibility: Query Monitor. The Query Monitor plugin was reporting false-positive errors indicating that many Comet Cache methods did not exist. This was due to how the Comet Cache codebase was utilizing PHP Closures, which Query Monitor had a hard time handling. The codebase has been refactored to use PHP Traits instead of Closures and now the Query Monitor plugin has no problem recognizing Comet Cache methods. Props to @NoahjChampion for reporting. See Issue #686.
• Compatibility: WP-CLI. When installing Comet Cache via WP-CLI, Comet Cache is now automatically enabled. There's no need to manually enable Comet Cache from within the plugin options after installing. Props @jaswsinc. See Issue #464.
• Required WordPress Version is now v4.2. The minimum required WordPress version has been bumped from v4.1 to v4.2. See Issue #706.

v160412-RC

• Enhancement: Several PHP 5.4+ enhancements, most notably a conversion from PHP Closures to PHP Traits. See Issue #635.
• Enhancement: Dashboard notices generated by Comet Cache now use the WordPress-style dismiss button to keep things consistent. See Issue #719.
• Enhancement: Dashboard notices generated by Comet Cache are now compacted into a single notice that can be expanded to view details. This helps reduce the number of messages that appear when, for example, a Post is published or updated and several cache files are automatically cleared. Instead of showing a separate notice for each type of cache file that was cleared, a single notice is shown with a link to toggle the details. See Issue #118.
• Enhancement (Pro): Improved the way the Auto-Cache Engine figures out the URL scheme (http vs https) that should be used when fetching the XML Sitemap. Instead of forcing http, whatever scheme is configured with the Home URL is now used. See Issue #715.
• Enhancement (Pro): The Pro Plugin Updater page now includes a "Save All Changes" button at the bottom, allowing you to save changes to the updater configuration without actually running the plugin updater. Props @bridgeport @NoahjChampion @1wdtv. See Issue #681.
• Bug Fix: Fixed a duplicated row of links on the Pro Plugin Updater page. See Issue #696.
• Bug Fix: Fixed an issue where some browsers would report "Failed to parse SourceMap" errors in their console when browsing the Comet Cache Options page. This was related to sourceMappingURL comments in the minified JS/CSS files that were intended for development purposes. Props to @1wdtv for reporting. See #732.
• Bug Fix: Fixed a UI bug in the Pro Preview that was causing the Manual Cache Clearing panel to not appear as part of the Pro Preview. Props @renzms. See Issue #711.
• Bug Fix (Pro): Fixed a bug related to the Pro Updater where some users who had migrated from ZenCache Pro to Comet Cache Pro were seeing an invalid new version message. Props @renzms @jaswsinc. See Issue #727
• Bug Fix (Pro): Fixed a bug with the Pro Plugin Updater that resulted in "Unknown error. Please wait 15 minutes and try again." when attempting to update Comet Cache Pro. The issue affected sites on servers running an old version of cURL (< v7.36) and/or an old version of OpenSSL, which made them unable to connect to the Comet Cache Pro update server. The Pro Plugin Updater now attempts to connect to a secondary update server that is more compatible with older versions of cURL and OpenSSL. See Issue #678.
• Hooks/Filters: Comet Cache now hooks into plugins_loaded instead of after_setup_theme when calling its own setup routine. This improves integration with other plugins that may be expecting the Comet Cache API functions to be available after plugins_loaded. Props to Frank Goossens (@futtta) from Autoptimize for helping with this. See Issue #716.
• Compatibility: Fixed a compatibility issue for some themes and plugins that were using old AC Plugin code designed to work with Quick Cache. This fix adds some backwards compatibility support for Quick Cache, but note that the first release of Comet Cache dropped support for Quick Cache backwards compatibility in favor of ZenCache backwards compatibility. See Issue #710.
• Compatibility: Query Monitor. The Query Monitor plugin was reporting false-positive errors indicating that many Comet Cache methods did not exist. This was due to how the Comet Cache codebase was utilizing PHP Closures, which Query Monitor had a hard time handling. The codebase has been refactored to use PHP Traits instead of Closures and now the Query Monitor plugin has no problem recognizing Comet Cache methods. Props to @NoahjChampion for reporting. See Issue #686.
• Compatibility: WP-CLI. When installing Comet Cache via WP-CLI, Comet Cache is now automatically enabled. There's no need to manually enable Comet Cache from within the plugin options after installing. Props @jaswsinc. See Issue #464.
• Required WordPress Version is now v4.2. The minimum required WordPress version has been bumped from v4.1 to v4.2. See Issue #706.

v160227

• Bug Fix: Fixed a ZenCache Backwards Compatibility bug that was preventing calls to $GLOBALS['zencache'] from working properly with Comet Cache. See Issue #689
• Bug Fix: Fixed a ZenCache Backwards Compatibility bug that was preventing ZENCACHE_ALLOWED from working properly with Comet Cache. See Issue #683.
• Bug Fix: Fixed a Quick Cache Backwards Compatibility bug that was preventing calls to $GLOBALS['quick_cache'] from working properly with Comet Cache. Props to @Kedakai for reporting. See Issue #691.
• Bug Fix (Pro): Fixed an Auto-Cache Engine bug that was preventing the Auto-Cache Engine from generating cached pages. Props @digitalhexcode for reporting. See Issue #679.
• Enhancement: Improved the way Comet Cache handles file locking in an effort to improve compatibility with various environments. There were reports of issues with PHP FPM/FastCGI and this release attempts to address those. See Issue #671
• Enhancement (Pro): A new HTML Compression option allows you to define whether or not HTML Compression should be enabled for Logged-In users (when Logged-In User caching is enabled). See Comet Cache → Plugin Options → HTML Compression → Enable HTML Compression for Logged-In Users?. Props @renzms. See Issue #650.
• Accelerated Mobile Pages (AMP) Compatibility: Added full support for Accelerated Mobile Pages via the AMP plugin. Comet Cache now works great alongside the AMP plugin. AMP-generated pages will be cached and those cache files will be intelligently cleared when necessary to keep things up-to-date. See Issue #688.

v160223.1

• Bug Fix: Fixes PHP Fatal Error when upgrading from Comet Cache v160211.

Comet Cache v160223

• Announcement: After March 1st, 2016 Comet Cache will require PHP Multibyte String support. The mbstring extension provides Multibyte String support to PHP and is required to properly handle UTF-8 characters, which many sites now use. Without Multibyte String support, caching will be unstable. For that reason we are requiring the mbstring extension to improve reliability when caching and to prevent your site from experiencing unforeseen issues in the future..
• Bug Fix (Multisite): Fixed a bug where when Comet Cache was Network Activated the plugin settings link would show up in the plugins list for the Main Site and would lead to a 404 error. The settings link is now only shown when viewing the plugins list from the Network Admin. Props @jaswsinc. See Issue #675.
• Enhancement: Added support-related links to the plugin options page. Props @renzms. See Issue #612.

ZenCache Pro v160222

• Announcement: ZenCache is changing its name to Comet Cache! Learn more about this upcoming change here.
• Announcement: This version of ZenCache requires PHP 5.4+. As announced in the previous release, the minimum PHP version required to run ZenCache has changed to PHP 5.4+ as of December 1st, 2015. Please see announcement with further details: New Minimum PHP Version: PHP 5.4
• Announcement: This version of ZenCache does not support the PHP APC Extension. As announced in the previous release, ZenCache no longer runs with the PHP APC extension enabled as of December 1st, 2015. Please see announcement with further details: PHP APC Extension No Longer Supported
• Announcement: After March 1st, 2016 ZenCache / Comet Cache will require PHP Multibyte String support. The mbstring extension provides Multibyte String support to PHP and is required to properly handle UTF-8 characters, which many sites now use. Without Multibyte String support, caching will be unstable. For that reason we are requiring the mbstring extension to improve reliability when caching and to prevent your site from experiencing unforeseen issues in the future.
• New Feature! The HTML Compressor now supports URI Exclusion Patterns, so you exclude specific pages or an entire series of pages from the HTML Compressor using the flexible Watered-Down Regex Syntax. Props @renzms. See Issue #651.
• Bug Fix: Fixed a bug that was preventing the "Evaluate Custom PHP Code when Clearing the Cache" feature from working properly. This bug resulted in the custom code not being run when the cache was cleared manually. See Issue #664.
• Bug Fix (Multisite): Fixed a bug where when ZenCache was Network Activated the plugin settings link would show up in the plugins list for the Main Site and would lead to a 404 error. The settings link is now only shown when viewing the plugins list from the Network Admin. Props @jaswsinc. See Issue #675.
• Enhancement: Fixed several PHP "Warning: preg_split() expects parameter 3 to be integer, null given". Props @Zwilla @renzms. See Issue #652.
• Updated WebSharks stats log endpoint URL. Props @kristineds. See Issue #661.
• Enhancement: Added support-related links to the plugin options page. Props @renzms. See Issue #612.

ZenCache Pro v160216-RC (Release Candidate)

• Announcement: ZenCache is changing its name to Comet Cache! Learn more about this upcoming change here.
• Announcement: This version of ZenCache requires PHP 5.4+. As announced in the previous release, the minimum PHP version required to run ZenCache has changed to PHP 5.4+ as of December 1st, 2015. Please see announcement with further details: New Minimum PHP Version: PHP 5.4
• Announcement: This version of ZenCache does not support the PHP APC Extension. As announced in the previous release, ZenCache no longer runs with the PHP APC extension enabled as of December 1st, 2015. Please see announcement with further details: PHP APC Extension No Longer Supported
• New Feature! The HTML Compressor now supports URI Exclusion Patterns, so you exclude specific pages or an entire series of pages from the HTML Compressor using the flexible Watered-Down Regex Syntax. Props @renzms. See Issue #651.
• Bug Fix: Fixed a bug that was preventing the "Evaluate Custom PHP Code when Clearing the Cache" feature from working properly. This bug resulted in the custom code not being run when the cache was cleared manually. See Issue #664.
• Enhancement: Fixed several PHP "Warning: preg_split() expects parameter 3 to be integer, null given". Props @Zwilla @renzms. See Issue #652.
• Updated WebSharks stats log endpoint URL. Props @kristineds. See Issue #661.