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<?php $prova = array(); $prova['prova']['123'] = $prova['prova']['123']++; print_r($prova['prova']['123']);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Warning: Undefined array key "prova" in /in/86pS6 on line 3 Warning: Undefined array key 123 in /in/86pS6 on line 3
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.21, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.6 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33
Notice: Undefined index: prova in /in/86pS6 on line 3 Notice: Undefined offset: 123 in /in/86pS6 on line 3
Output for 7.3.32 - 7.3.33
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 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Notice: Undefined index: prova in /in/86pS6 on line 3 Notice: Undefined index: 123 in /in/86pS6 on line 3

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