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run code in 150+ php & hhvm versions
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<?php $a = array(array("a","Z"),array("b","Y"),array("c","X")); $b = array_map(reset,$a); var_dump($b);
based on aCh7H
Output for 4.3.0 - 7.1.0
Notice: Use of undefined constant reset - assumed 'reset' in /in/jJFoD on line 6 array(3) { [0]=> string(1) "a" [1]=> string(1) "b" [2]=> string(1) "c" }