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run code in 200+ php & hhvm versions
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<?php $a = array(); $a['foo'] = "Hello"; $a['foo']['bar'] = "World"; var_dump($a);
based on udndV
Output for 5.4.0 - 5.6.30, 7.0.0 - 7.2.0
Warning: Illegal string offset 'bar' in /in/WDJfm on line 5 array(1) { ["foo"]=> string(5) "Wello" }
Output for 4.3.0 - 5.3.29, hhvm-3.10.1 - 3.22.0
array(1) { ["foo"]=> string(5) "Wello" }