Convert exponential number to decimal in php

Question

I have a floating point number in exponential format i.e. 4.1595246940817E-17 and I want to convert it into decimal number like 2.99 etc.

Any help will

Answer 1

You could remove the decimal point ($x is your number):

$strfloat = strtolower((string)($x));
$nodec = str_replace(".", "", $x);

Then extract the exponential part.

list($num, $exp) = explode("e", $nodec);
$exp = intval($exp);

Then you have the decimal, and the number, so you can format it:

if($exp < 0) return "0." . ("0" * -($exp + 1)) . $num;
if($exp == 0) return (string)$x;
if($exp > 0) return $num . ("0" * $exp);

This doesn't add precision though, just extra zeroes.