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<?php function AlphabetSoup($data,$currentValues) { $result =[]; foreach ($currentValues as $key => $value){ if($data[$key] == $value) continue; $result[$key] = $value; // if($data['allocation_even'] ==! $currentValues['allocation_even']) { // $result['allocation_even'] = $data['allocation_even']; // } // $differences = array_merge(array_diff(explode(',', $data['os_targeting']), explode(',' , $currentValues['os_targeting'])) // , array_diff(explode(',', $currentValues['os_targeting']), explode(',' ,$data['os_targeting']))); // if(!empty($differences)) { // $result['os_targeting'] = $data['os_targeting']; } return $result; } $data = [ 'allocation_even' => '1' , 'os_targeting' => 'Mac_OS_X,Linux,Win']; $current = [ 'allocation_even' => '1' , 'os_targeting' => 'Win,Mac_OS_X,Linux', 'other_value'=>0]; print_r( AlphabetSoup($data,$current));

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