Question

How to sum a number digits powered by their respective positions in PHP

Answer 1

// 4 ^ 1 + 6 ^ 2 + 9 ^ 3 + 8 ^ 4 = 4 + 36 + 729 + 4096 = 4865 

$num = 4698;

$len = strlen((string)abs($num));
 
$sum = 0.0;
 
$temp = $num;
while ($temp > 0) {
    $remainder = $temp % 10;
    $sum = $sum + pow($remainder, $len);
    $temp = (int)($temp / 10);
    $len--;
}

echo $sum;

 
 
 
/*
run:
 
4865
 
*/

 

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