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run code in 200+ php & hhvm versions
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<?php $arr = [[1,2,3,4,5],"abc",3,4,5]; echo "<pre>"; print_r($arr);
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0rc3
<pre>Array ( [0] => Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 ) [1] => abc [2] => 3 [3] => 4 [4] => 5 )