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Editing: class-cache.php

<?php
defined( 'ABSPATH' ) or die( );
if ( ! class_exists( 'rsssl_cache' ) ) {
	class rsssl_cache {
		private static $_this;

public function __construct() {
			if ( isset( self::$_this ) ) {
				wp_die( 'you cannot create a second instance.' );
			}

self::$_this = $this;
		}

public static function this() {
			return self::$_this;
		}

/**
		 * Flushes the cache for popular caching plugins to prevent mixed content errors
		 * When .htaccess is changed, all traffic should flow over https, so clear cache when possible.
		 * supported: W3TC, WP fastest Cache, Zen Cache, wp_rocket
		 *
		 * @since  2.0
		 *
		 * @access public
		 *
		 */

public function flush() {
			if ( ! rsssl_user_can_manage() ) {
				return;
			}

add_action( 'admin_head', array( $this, 'maybe_flush_w3tc_cache' ) );
			add_action( 'admin_head', array( $this, 'maybe_flush_wp_optimize_cache' ) );
			add_action( 'admin_head', array( $this, 'maybe_flush_litespeed_cache' ) );
			add_action( 'admin_head', array( $this, 'maybe_flush_hummingbird_cache' ) );
			add_action( 'admin_head', array( $this, 'maybe_flush_fastest_cache' ) );
			add_action( 'admin_head', array( $this, 'maybe_flush_autoptimize_cache' ) );
			add_action( 'admin_head', array( $this, 'maybe_flush_wp_rocket' ) );
			add_action( 'admin_head', array( $this, 'maybe_flush_cache_enabler' ) );
			add_action( 'admin_head', array( $this, 'maybe_flush_wp_super_cache' ) );
		}

public function maybe_flush_w3tc_cache() {
			if ( ! rsssl_user_can_manage() ) {
				return;
			}

if ( function_exists( 'w3tc_flush_all' ) ) {
				w3tc_flush_all();
			}
		}

public function maybe_flush_wp_optimize_cache() {
			if ( ! rsssl_user_can_manage() ) {
				return;
			}

if ( function_exists( 'wpo_cache_flush' ) ) {
				wpo_cache_flush();
			}
		}

public function maybe_flush_litespeed_cache() {
			if ( ! rsssl_user_can_manage() ) {
				return;
			}

if ( class_exists( 'LiteSpeed' ) ) {
				Litespeed\Purge::purge_all();
			}
		}

public function maybe_flush_hummingbird_cache() {
			if ( ! rsssl_user_can_manage() ) {
				return;
			}

if ( is_callable( array( 'Hummingbird\WP_Hummingbird', 'flush_cache' ) ) ) {
				Hummingbird\WP_Hummingbird::flush_cache();
			}
		}

public function maybe_flush_fastest_cache() {
			if ( ! rsssl_user_can_manage() ) {
				return;
			}

if ( class_exists( 'WpFastestCache' ) ) {
				// Non-static cannot be called statically ::
				( new WpFastestCache() )->deleteCache();
			}
		}

public function maybe_flush_autoptimize_cache() {
			if ( ! rsssl_user_can_manage() ) {
				return;
			}

if ( class_exists( 'autoptimizeCache' ) ) {
				autoptimizeCache::clearall();
			}
		}

public function maybe_flush_wp_rocket() {
			if ( ! rsssl_user_can_manage() ) {
				return;
			}

if ( function_exists( 'rocket_clean_domain' ) ) {
				rocket_clean_domain();
			}
		}

public function maybe_flush_cache_enabler() {
			if ( ! rsssl_user_can_manage() ) {
				return;
			}

if ( class_exists( 'Cache_Enabler' ) ) {
				Cache_Enabler::clear_complete_cache();
			}
		}

public function maybe_flush_wp_super_cache() {
			if ( ! rsssl_user_can_manage() ) {
				return;
			}

if ( function_exists( 'wp_cache_clear_cache' ) ) {
				wp_cache_clear_cache();
			}
		}
	}//class closure
}

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