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run code in 200+ php & hhvm versions
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<?php $a = 't'; $t = array('test' => 'hello', 0 => 'zero', 1 => 'one'); print_r( $$a[0]);
Output for 7.0.0 - 7.3.0rc4
zero
Output for 4.3.0 - 5.6.28
Array ( [test] => hello [0] => zero [1] => one )