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<?php echo var_dump(serialize(array('country' => 'DE', 'pid' => 520, 'option' => 'sms')));
Output for 4.3.0 - 7.1.0
string(68) "a:3:{s:7:"country";s:2:"DE";s:3:"pid";i:520;s:6:"option";s:3:"sms";}"