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run code in 150+ php & hhvm versions
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<?php function foo($v) { return $v; } var_dump(array_map('foo', array("key" => "value")));
Output for 4.3.0 - 5.6.22, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(1) { ["key"]=> string(5) "value" }