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run code in 200+ php & hhvm versions
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<?php $arr = array(); $arr['nombre']='David'; echo $arr['nombre']; echo $arr[0]; ?>
Output for 5.3.0 - 7.2.0
David Notice: Undefined offset: 0 in /in/Xdv92 on line 7
Output for 4.3.0 - 5.2.17
David Notice: Undefined offset: 0 in /in/Xdv92 on line 7