ReturnSource
Clears user-space cache.
This method requires valid xcache admin credentials to be set when the adapter was configured, due to the use of the xcache_clear_cache admin method. If the xcache.admin.enable_auth ini setting is set to "Off", no credentials required.

Returns

mixed True on successful clear, false otherwise.

Source

						public function clear() {
		$admin = (ini_get('xcache.admin.enable_auth') === "On");
		if ($admin && (!isset($this->_config['username']) || !isset($this->_config['password']))) {
			return false;
		}
		$credentials = array();

		if (isset($_SERVER['PHP_AUTH_USER'])) {
			$credentials['username'] = $_SERVER['PHP_AUTH_USER'];
			$_SERVER['PHP_AUTH_USER'] = $this->_config['username'];
		}
		if (isset($_SERVER['PHP_AUTH_PW'])) {
			$credentials['password'] = $_SERVER['PHP_AUTH_PW'];
			$_SERVER['PHP_AUTH_PW'] = $this->_config['pass'];
		}

		for ($i = 0, $max = xcache_count(XC_TYPE_VAR); $i < $max; $i++) {
			if (xcache_clear_cache(XC_TYPE_VAR, $i) === false) {
				return false;
			}
		}

		if (isset($_SERVER['PHP_AUTH_USER'])) {
			$_SERVER['PHP_AUTH_USER'] =
				($credentials['username'] !== null) ? $credentials['username'] : null;
		}
		if (isset($_SERVER['PHP_AUTH_PW'])) {
			$_SERVER['PHP_AUTH_PW'] =
				($credentials['password'] !== null) ? $credentials['password'] : null;
		}
		return true;
	}