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run code in 200+ php & hhvm versions
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<?php function i(){(0);}function m($f,$a){return array_map($f,0);}echo implode(m("",m("",("i"("",m("%n",("")))))));
based on GjEEA
Output for 7.0.0 - 7.2.0
Warning: array_map() expects parameter 1 to be a valid callback, function '%n' not found or invalid function name in /in/U5FfZ on line 2 Warning: array_map() expects parameter 1 to be a valid callback, function '' not found or invalid function name in /in/U5FfZ on line 2 Warning: array_map() expects parameter 1 to be a valid callback, function '' not found or invalid function name in /in/U5FfZ on line 2 Warning: implode(): Argument must be an array in /in/U5FfZ on line 2
Output for 5.3.20 - 5.6.28
Parse error: syntax error, unexpected '(' in /in/U5FfZ on line 2
Process exited with code 255.