<?php $arrayA = [ 'a' => '150', 'b' => '200', 'c' => '300', 'd' => '1000', 'e' => '350', 'f' => '1000' ]; $arrayB = [ 'a' => '500', 'b' => '400', 'd' => '1000', 'f' => '1000' ]; $arrayC = []; foreach($arrayA as $keyA => $valueA) { if (array_key_exists($keyA, $arrayB)) { $arrayC[$keyA] = floor((($arrayB[$keyA] - $valueA) / $valueA ) * 100) . "%"; continue; } $arrayC[$keyA] = "No match"; } print_r($arrayC);
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