Display a complete number without scientific writing php

Question

Hello I would like to display in my code a full number to 20 decimal without scientific notation. I think it's a memory problem in php. can you help me ? thanks

function get($l, $c)
{
    $value = 0;

    if (0 <= $c && $c <= $l && $l < 5000) {
        $tab = [];

        for ($i = 0; $i <= $l; $i++) {

            for ($j = 0; $j <= $c; $j++) {

                if ($i == $j || $i - 1 <= 0 || $j <= 0) {
                    $tab[$i][$j] = 1;
                    $value = $tab[$i][$j];
                } elseif ($i != $j) {
                    $tab[$i][$j] = ($tab[$i - 1][$j - 1]) + ($tab[$i - 1][$j]);
                    $value = $tab[$i][$j];
                }
            }
        }
    }
    return $value;
}
echo get(67, 34); // found  :1.422652073762E+19 , excpected:14226520737620288370

a function which calculates a generic construction model with matrix — tamda, Feb 15 '21 at 13:12

score 1 · Accepted Answer · answered Feb 14 '21 at 14:53

Have a look at BCMath functions:

function get($l, $c)
{
    $value = 0;

    if (0 <= $c && $c <= $l && $l < 5000) {
        $tab = [];

        for ($i = 0; $i <= $l; $i++) {

            for ($j = 0; $j <= $c; $j++) {

                if ($i == $j || $i - 1 <= 0 || $j <= 0) {
                    $tab[$i][$j] = 1;
                    $value = $tab[$i][$j];
                } elseif ($i != $j) {
                    // magic happens here
                    $tab[$i][$j] = bcadd($tab[$i - 1][$j - 1], $tab[$i - 1][$j]); 
                    $value = $tab[$i][$j];
                }
            }
        }
    }
    return $value;
}

$result = get(67, 34);
var_dump($result == '14226520737620288370');
echo $result;

Output

bool(true)
14226520737620288370

Working example.

score 0 · Answer 2 · answered Feb 14 '21 at 13:51

0

There is that : https://www.php.net/manual/en/function.number-format.php

You can print any number and choose number of decimals you want

answered Feb 14 '21 at 13:51

Victorbzh

84
1
1
6

I have already tried it does not work, it does not display the same thing there is a difference on the last 4 decimal places with : $sol = number_format($value, 0, '', ''); it display 14226520737620287488 – tamda Feb 14 '21 at 13:53
@user15140816 Did you try `echo number_format( get(67, 34),0); // = 14,226,520,737,620,287,488` – RiggsFolly Feb 14 '21 at 13:57
yes but the result excpected is : 14226520737620288370 – tamda Feb 14 '21 at 13:58
1

Are you completely sure about that – RiggsFolly Feb 14 '21 at 13:59
Yes sur I tried several functions exemple $large_number = 14226520737620288370; var_dump($large_number) ; it display : float(1.422652073762E+19) – tamda Feb 14 '21 at 14:02
Try this `$large_number = 14226520737620288370; var_dump($large_number); $large_number = 14226520737620287488; var_dump($large_number);` See they both give the same – RiggsFolly Feb 14 '21 at 14:12
– tamda Feb 14 '21 at 14:42

Display a complete number without scientific writing php

2 Answers2

Output