# s2member/111206/includes/classes/no-cache.inc.php

s2Member – Excellent for All Kinds of Memberships, Content Restriction Paywalls & Member Access Subscriptions, version 111206. 196 lines.

- Page: https://pluginprobe.com/plugins/s2member/111206/code/includes/classes/no-cache.inc.php
- Raw: https://pluginprobe.com/plugins/s2member/111206/raw/includes/classes/no-cache.inc.php
- Modified: 2011-12-06T12:37:48+00:00

Line numbers below start at 1. Link to a line or a range by appending a fragment to the
page URL, for example `https://pluginprobe.com/plugins/s2member/111206/code/includes/classes/no-cache.inc.php#L10-L20`.

```php
<?php
/**
* No-cache routines.
*
* Copyright: © 2009-2011
* {@link http://www.websharks-inc.com/ WebSharks, Inc.}
* ( coded in the USA )
*
* Released under the terms of the GNU General Public License.
* You should have received a copy of the GNU General Public License,
* along with this software. In the main directory, see: /licensing/
* If not, see: {@link http://www.gnu.org/licenses/}.
*
* @package s2Member\No_Cache
* @since 3.5
*/
if (realpath (__FILE__) === realpath ($_SERVER["SCRIPT_FILENAME"]))
	exit ("Do not access this file directly.");
/**/
if (!class_exists ("c_ws_plugin__s2member_no_cache"))
	{
		/**
		* No-cache routines.
		*
		* @package s2Member\No_Cache
		* @since 3.5
		*/
		class c_ws_plugin__s2member_no_cache
			{
				/**
				* No-cache headers required?
				*
				* @package s2Member\No_Cache
				* @since 111115
				*
				* @var null|bool
				*/
				public static $headers;
				/**
				* Handles no-cache constants, and no-cache headers.
				*
				* @package s2Member\No_Cache
				* @since 3.5
				*
				* @attaches-to ``add_action("init");``
				* @also-called-by Other routines within s2Member.
				*
				* @param bool $no_cache Optional. Defaults to false. If true, force no-cache if at all possible.
				* @return bool This function will always return `true`.
				*/
				public static function no_cache ($no_cache = FALSE)
					{
						do_action ("ws_plugin__s2member_before_no_cache", get_defined_vars ());
						/**/
						c_ws_plugin__s2member_no_cache::no_cache_constants ($no_cache) . c_ws_plugin__s2member_no_cache::no_cache_headers ($no_cache);
						/**/
						do_action ("ws_plugin__s2member_after_no_cache", get_defined_vars ());
						/**/
						return true; /* Always return true. */
					}
				/**
				* Defines no-cache constants for various WordPress® plugins.
				*
				* This is compatible with Quick Cache, W3 Total Cache, and also with WP Super Cache.
				* Quick Cache uses: ``QUICK_CACHE_ALLOWED``, and other plugins use: ``DONOTCACHEPAGE``.
				* W3 Total Cache is also known to be compatible with ``DONOTCACHEOBJECT`` and ``DONOTCACHEDB``.
				*
				* Disallow caching if the ``$no_cache`` parameter is passed in as ``true``, by other routines.
				* In addition, always disallow caching for logged in users, and GET requests with: `/?s2member` Systematics.
				* For clarity on s2Member Systematics, see: {@link s2Member\Systematics\c_ws_plugin__s2member_systematics::is_s2_systematic_use_page()}.
				*
				* However, this routine will ALWAYS obey the `?qcAC` query string parameter.
				* 	This Quick Cache parameter explicitly allows caching to occur.
				*
				* @package s2Member\No_Cache
				* @since 3.5
				*
				* @also-called-by Other routines within s2Member.
				*
				* @param bool $no_cache Optional. Defaults to false. If true, force no-cache if at all possible.
				* @return bool This function will always return `true`.
				*/
				public static function no_cache_constants ($no_cache = FALSE)
					{
						static $once; /* We only need to set these constants once. */
						/**/
						eval ('foreach(array_keys(get_defined_vars())as$__v)$__refs[$__v]=&$$__v;');
						do_action ("ws_plugin__s2member_before_no_cache_constants", get_defined_vars ());
						unset ($__refs, $__v); /* Unset defined __refs, __v. */
						/**/
						if (!$once && empty ($_GET["qcAC"]) && ($no_cache || is_user_logged_in () || c_ws_plugin__s2member_systematics::is_s2_systematic_use_page ()))
							{
								/**
								* No-cache DB queries for plugins.
								*
								* @package s2Member\No_Cache
								* @since 111115
								*
								* @var bool
								*/
								if (!defined ("DONOTCACHEDB"))
									define ("DONOTCACHEDB", true);
								/**
								* No-cache Page for plugins.
								*
								* @package s2Member\No_Cache
								* @since 3.5
								*
								* @var bool
								*/
								if (!defined ("DONOTCACHEPAGE"))
									define ("DONOTCACHEPAGE", true);
								/**
								* No-cache Objects for plugins.
								*
								* @package s2Member\No_Cache
								* @since 111115
								*
								* @var bool
								*/
								if (!defined ("DONOTCACHEOBJECT"))
									define ("DONOTCACHEOBJECT", true);
								/**
								* No-cache anything for Quick Cache plugin.
								*
								* @package s2Member\No_Cache
								* @since 3.5
								*
								* @var bool
								*/
								if (!defined ("QUICK_CACHE_ALLOWED"))
									define ("QUICK_CACHE_ALLOWED", false);
								/**/
								$once = true; /* Only need to set these constants one time. */
								/**/
								c_ws_plugin__s2member_no_cache::$headers = /* Headers required too. */ true;
								/**/
								do_action ("ws_plugin__s2member_during_no_cache_constants", get_defined_vars ());
							}
						/**/
						do_action ("ws_plugin__s2member_after_no_cache_constants", get_defined_vars ());
						/**/
						return true; /* Always return true. */
					}
				/**
				* Sends Cache-Control ( no-cache ) headers.
				*
				* Disallow browser caching if the ``$no_cache`` parameter is passed in as ``true``, by other routines.
				* Disallow browser caching when/if no-cache Constants are set by {@link s2Member\No_Cache\c_ws_plugin__s2member_no_cache::no_cache_constants()},
				* 	via static variable boolean value for: ``c_ws_plugin__s2member_no_cache::$headers``.
				*
				* However, this routine will ALWAYS obey the `?qcABC` query string parameter.
				* 	This Quick Cache parameter explicitly allows browser caching to occur.
				*
				* @package s2Member\No_Cache
				* @since 3.5
				*
				* @also-called-by Other routines within s2Member.
				*
				* @param bool $no_cache Optional. Defaults to false. If true, force no-cache if at all possible.
				* @return bool This function will always return `true`.
				*/
				public static function no_cache_headers ($no_cache = FALSE)
					{
						static $once; /* We only need to set these headers one time. */
						/**/
						eval ('foreach(array_keys(get_defined_vars())as$__v)$__refs[$__v]=&$$__v;');
						do_action ("ws_plugin__s2member_before_no_cache_headers", get_defined_vars ());
						unset ($__refs, $__v); /* Unset defined __refs, __v. */
						/**/
						$using_selective_behavior = /* Off by default. */ apply_filters ("ws_plugin__s2member_no_cache_headers_selective", false, get_defined_vars ());
						/**/
						if (!$once && !headers_sent () && empty ($_GET["qcABC"]) && ($no_cache || !$using_selective_behavior || c_ws_plugin__s2member_no_cache::$headers))
							if ( /* Give Filters a chance. */!apply_filters ("ws_plugin__s2member_disable_no_cache_headers", false, get_defined_vars ()))
								{
									foreach (headers_list () as $header) /* No-cache headers already sent? We need to check here. */
										if (stripos ($header, "no-cache") !== false) /* No-cache headers already sent? */
											{
												$no_cache_headers_already_sent = true; /* Yep, sent. */
												break; /* Break now, no need to continue further. */
											}
									if (!isset ($no_cache_headers_already_sent)) /* Not yet? */
										nocache_headers (); /* Only if NOT already sent. */
									/**/
									$once = true; /* This is static var. Only send headers once. */
									/**/
									do_action ("ws_plugin__s2member_during_no_cache_headers", get_defined_vars ());
								}
						/**/
						do_action ("ws_plugin__s2member_after_no_cache_headers", get_defined_vars ());
						/**/
						return true; /* Always return true. */
					}
			}
	}
?>
```