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<?php /** * Sum byte values from $start of $str **/ function sum($str, $start) { $sum = 0; $i = $start; for ( $max = strlen($str); $i < $max; ++$i) { $sum += ord($str[$i]); } return $sum; } $str = 'Hello, Dolly'; echo sum($str, strpos($str, ' '));

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