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<?php $var = 'a'; $var2 = 'b'; var_dump(compact('var', 'var2'));
based on kE2Z3
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(2) { ["var"]=> string(1) "a" ["var2"]=> string(1) "b" }