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run code in 200+ php & hhvm versions
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<?php $ch="s1"; $_SESSION[$ch] = array(); $_SESSION[$ch][] = 11; $_SESSION[$ch][] = 22; var_dump($_SESSION);
Output for 4.3.0 - 7.2.0
array(1) { ["s1"]=> array(2) { [0]=> int(11) [1]=> int(22) } }