public function pom() {
$array = [25, 12, 5, 82, 15];
$result = 0;
for($i = 0; $i < count($array); $i++) {
$first = str_split($array[$i]);
if(is_numeric($first[0]))
$result += $first[0];
}
return $result;
}
it works like this but question says i cannot use strings . Does it mean i cannot use str_split ?
You can do that with substr array_map() and array_sum(),
<?php
$array = [25, 12, 5, 82, 15];
function sum_first_digit($array) {
$sum = array_sum(array_map(function ($a){return
substr($a,0,1);}, $array));
return $sum;
}
echo sum_first_digit($array);
?>
Output: 17
Extracting the first digit without the use of a string function means in my opinion only using calculations. Example:
$n = 781234;
$result = intdiv($n,pow(10,floor(log10($n)))); // 7