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]<?php $arr = array(1,1,2,2,3,3,4,4,5,5,6,6,7,7,8); $v = array_reduce($arr, function($x, $v) { return $x ^= $v; }); var_dump($v);
Output for git.master, git.master_jit, rfc.property-hooks
]int(8)

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