- strpos: documentation ( source)
- ord: documentation ( source)
<?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, ' '));