have a better method to run this php?

Question

Have another way to run this number generator? I want all the zeros. for exampe 0.00000000000000000000000009949 instead 9.949E-26

my code:

<?php
    ini_set('max_execution_time', 3000000000);
    $myfile = fopen("numbers.txt", "w") or die("Unable to open file!");
    for ($i = 0; $i <= 1; $i+= 0.000000000000000000000000000001) {
        $txt = $i.";";
        fwrite($myfile, $txt);
    }
    fclose($myfile);
?>

why not better use `str_repeat()` or `str_pad()` or `str_fill()` to generate the zeros? — JOUM, Oct 18 '16 at 21:02
I've edited the post. i want generate all numbers from 0 to 1 incrementing by 1E-30 — Kelvin Primo, Oct 18 '16 at 21:03
You should read up on floating point math. Specifically, it is not always the case that 1 + 0.000000001 = 1.000000001 — Erik Godard, Oct 18 '16 at 21:04

score 1 · Accepted Answer · answered Oct 18 '16 at 21:14

Look at number_format

for ($i = 0; $i <= 1; $i += 0.000000000000000000000000000001) {
    $txt = number_format($i, 30) . ";";
    fwrite($myfile, $txt);
}

This will give you all the zeros or even more, if you like. At least up to some precision, see Wikipedia - IEEE floating point for details.

JOUM · Answer 2 · 2016-10-18T21:16:29.080

0

if PHP_MAX_INTEGER is not reached you can count down or up and add from left to a given length filling zeros and 0. to create the string and to prevent comma operations

like "0.".str_pad($i,30-strlen($i),'0', STR_PAD_LEFT)."$i\n"

edited Oct 18 '16 at 21:16

answered Oct 18 '16 at 21:09

JOUM

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have a better method to run this php?

2 Answers2