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<?php var_dump($s = unserialize('a:1:{s:13:"administrator";s:1:"1";}')); $s['talem'] = 1; var_dump(serialize($s));
based on OW1MC
Output for 4.3.0 - 7.2.0
array(1) { ["administrator"]=> string(1) "1" } string(51) "a:2:{s:13:"administrator";s:1:"1";s:5:"talem";i:1;}"