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capfsb/gist:c857127d6252170991aec127c7fbae77

Created February 24, 2018 09:52
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gistfile1.txt
<?
$a=[1,1,1,2,3,3,4,5,5,5,5,6,6,6,6];
foreach($a as $v)
{
$count[$v] = $count[$v] ?? 0;
++$count[$v];
}
echo join(' ',array_keys(array_filter($count,function($v){return $v % 2 == 1;})));
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