<?php $arr = [ 0 => "556878", 1 => "12345", 2 => "12345", 3 => "234567", 4 => "45673", 5 => "45673", ]; function getNtimes($arr, $n) { $temp = array_count_values($arr); return array_keys(array_filter($temp, function ($value) use (&$n) { return $value == $n; })); } $arr = getNtimes($arr, 2); print_r($arr);die;
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