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<?php $arr1 = [0 => 0, 1 => 0, 2 => 8, 3 => 0, 11 => 0, 12 => 0, 15 => 0]; $arr2 = range(1,max($arr1)); // use array_diff to get the missing numbers and create a new array with them $missingNumbers = array_diff($arr1,$arr2); $keys = array_keys($missingNumbers); $Sonuc = array_replace(array_fill(min($keys), max($keys), 999), $arr1); print_r($Sonuc);
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