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<?php function map(callable $callable) { return array_map($callable, [1,2]); } var_dump(map('strval'));
based on JPS4b
Output for 5.6.30, hhvm-3.18.5 - 3.22.0, 7.0.30 - 7.3.0alpha1
array(2) { [0]=> string(1) "1" [1]=> string(1) "2" }