PHP takes remainder

I want to know what 21712341byte is in the K position, what about the M position, and the G position? This is equivalent to a hexadecimal conversion problem. It’s just that the base system to be converted now is 1024.                  
                                                                                                                                                                                                                                                                                                       



//Get the numerical value in the base digit

 function getRemainder($num, $bin, $pos, &$result = 0){ /$bin The base to be converted
//$pos The number of digits
 To find the integer
                                                                                                                                          $new_num = $num % pow($bin, $floor_len);
 $remainder($new_num, $bin, $pos, $result);
 }else{
 $result = floor($num / $base);
 }
return $result;
}

//For example, when the value 16 is converted to base 9, what is the first digit of it?
$a = getRemainder(16,9, 1);
echo $a;//Output 7



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