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<?php return ($var->$var2)[0];
based on iZWsN
Output for 7.2.0
Notice: Undefined variable: var in /in/YFhWN on line 3 Notice: Undefined variable: var2 in /in/YFhWN on line 3 Notice: Trying to get property '' of non-object in /in/YFhWN on line 3
Output for 7.0.0 - 7.1.10
Notice: Undefined variable: var in /in/YFhWN on line 3 Notice: Undefined variable: var2 in /in/YFhWN on line 3 Notice: Trying to get property of non-object in /in/YFhWN on line 3
Output for 5.3.22 - 5.6.28
Parse error: syntax error, unexpected '[' in /in/YFhWN on line 3
Process exited with code 255.