let's say I have a variable containing an integer or a float (since integers might overflow into a float in PHP).
I want to run some operation to get the leftmost digit and the rest of the remaining digits.
To explain better:
<?php
$x = NULL; //this will hold first digit
$num = 12345; //int
/// run operation
//outputs
//$x = 1;
//$num = 2345;
var_dump($x, $num);
?>
Now, I know there's multitudes of ways to do this if you represent the number as a string, but I'm trying to avoid type casting it into a string.
I'm probably looking for a solution which includes bitwise operations, but I'm pretty weak in that topic so I'm hoping someone who usually works low-level might be able to answer this!
Thanks a bunch.
Avoids using any string manipulation, but no guarantees for float or even negative values
$x = NULL; //this will hold first digit
$num = 12345; //int
$m = 1;
while(true) {
$m *= 10;
if ($m > $num)
break;
}
$m /= 10;
$x = (int) floor($num / $m);
$num = $num % $m;
//outputs
//$x = 1;
//$num = 2345;
var_dump($x, $num);