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