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<? $number = array(2,1,4,3,6,2); for($i=0;$i<count($number); $i+=2){ $dif[] = $number[$i] - $number[$i+1]; } print_r($dif); $sum = 0; foreach ($dif as $item){ $sum += $item; } echo 'SUM = '.$sum; ?>
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Array ( [0] => 1 [1] => 1 [2] => 4 ) SUM = 6