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<?php $data = 'aamdkc'; $chars = array(1 => 'a', 2 => 'b', 3 => 'c');// Chars start from a-z $sum = 0; foreach (str_split($data) as $char) { if (($index = array_search($char, $chars)) !== false) { $sum += $index; } } echo $sum;
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