<?php $arrays = [ 51 => [ 5 => "", 2 => "", 8 => "" ], 78 => [ 18 => "", 23 => "", 21 => "" ], 8 => [ 18 => "", 23 => "", 21 => "" ] ]; $result = array_reduce($arrays, function($carry, $item) { $carry = array_merge($carry, $item); return $carry; }, []); if (count(array_filter($result)) === 0) { echo "array contains only empty values"; }
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