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@ 2017-07-13T13:20:21Z

<?php

$seq = [2, 2, 3, 3, 3, 4, 4, 4, 4];


    $test =  array_reduce($seq, function($carry, $value) {
          return $carry ^ $value;
    });
    
    var_dump($test);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
array_reduce: documentation ( source)

preferences:dark modelive preview

40.72 ms | 402 KiB | 5 Q