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run code in 150+ php & hhvm versions
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<?php $s="1"; $s[8]="9"; var_dump($s);
based on KRjLW
Output for 4.3.0 - 5.2.9, 5.2.12 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(9) "1 9"
Output for 5.2.10 - 5.2.11
Notice: Uninitialized string offset: 8 in /in/ucoOE on line 3 string(9) "1 9"