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run code in 150+ php & hhvm versions
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<?php $fnc = create_function('$a', 'eval("\$GLOBALS[\'get\'][] = $a;");'); var_dump($fnc); print_r($fnc); printf($fnc);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(9) "lambda_1" lambda_1lambda_1