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@ 2013-10-08T14:15:28Z

<?php

$ch="s1";
    $_SESSION[$ch] = array();

    $_SESSION[$ch][count($_SESSION[$ch])] = 11;
    $_SESSION[$ch][count($_SESSION[$ch])] = 22;

var_dump($_SESSION);

Output
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var_dump: documentation ( source)

preferences:dark modelive preview

42.49 ms | 402 KiB | 5 Q