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run code in 150+ php & hhvm versions
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<?php $prova = array(); $prova['prova']['123'] = $prova['prova']['123']++; print_r($prova['prova']['123']);
Output for 5.4.0 - 5.6.21, 7.0.0 - 7.1.0
Notice: Undefined index: prova in /in/86pS6 on line 3 Notice: Undefined offset: 123 in /in/86pS6 on line 3
Output for hhvm-3.12.0
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.3.0 - 5.3.29
Notice: Undefined index: prova in /in/86pS6 on line 3 Notice: Undefined index: 123 in /in/86pS6 on line 3
Output for 4.3.0 - 5.2.17
Notice: Undefined index: prova in /in/86pS6 on line 3 Notice: Undefined index: 123 in /in/86pS6 on line 3