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Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
<?php
function bigSum(string $a, string $b): string {
$a_arr = array_reverse(str_split($a));
$b_arr = array_reverse(str_split($b));
$res = [];
$l = max(count($a_arr), count($b_arr));
for ($c=0; $c<$l; $c++) {
$r = ($a_arr[$c] ?? 0) + ($b_arr[$c] ?? 0);
if ($r < 10) $res[] = $r;
}
return implode('', array_reverse($res));
}
echo bigSum('1000000000000000000000000000001','465');