How to convert number into billions for a smaller comparison chain?

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3

Imagine you have an exercise in the following aspect, I need to take from an array with random integers, the largest number that is between the intervals.

For example, I have an array: array(2, 8, 4);

  1. would have to order: 2,4,8

  2. check the range 2 to 4 = 2, and 4 to 8 = 4

  3. the longest interval, in this case, would be the 4, between 4 and 8.

Starting from that idea, I have the following code structure:

<?php

class VerifyNumbers
{

    private $arr = array();

    public function __construct(array $arr)
    {
        $this->arr = $arr;
    }

    public function verifyMaxIntersectionFromArray()
    {
        $collection = array();

         sort($this->arr);

        for ($i= 0; $i < count($this->arr); $i++) {
            if (isset($this->arr[$i + 1])) {
               $collection[] = ($this->arr[$i + 1] - $this->arr[$i]);
            }
        } 
        return max($collection);
    }

}

$verifyNumber = new VerifyNumbers(array(100, 3000, 4000, 25, 540, 20, 200, 300));
$maxIntersection = $verifyNumber->verifyMaxIntersectionFromArray();

echo $maxIntersection;

The question I ask is, if in this case, I had input values in this array that were more than 4 billion, or even larger, because there could be negative numbers, which would double, the range, how could I convert these input numbers into a smaller, readable string, because in PHP 5, an invalid digit is passed to octal integer (for example, 8 or 9), the rest of the number will be ignored.

php logic

  • This might help Ivan: http://answall.com/questions/9299/integercom-0-%C3%A0-left-%C3%A9-printed-as-other-n%C3%Bamero

  • 1

    http://www.php.net/manual/en/book.bc.php

  • Does your PHP is 32 bits and is breaking the maximum limit of numbers?

  • I found your description a little confusing. "the greater number that is between the intervals. "? From 2 to 4 = 2 ( 2 is less than 4 and not greater, so you refer to 4-2? Or do you want the smallest of them instead of the largest? ) 4 to 8 = 4 (same thing as the previous query)

  • yes, I mean subtraction.

1 answer

0

You should format the number. Let’s imagine that $num is the number variable I want to format:

echo "O seu número formatado é: ". number_format($num, 4);

What’s in front of the $num is how many houses this number will have. So in that case instead of being for example 1.000000 it will be 1.0000!

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