big numbers

toshog

two mahines. one old one and one new one. old has php 5.2.6, the new one has 5.2.10. i'm porting some code.

$count_start = 10594;
echo $for_start = 1000000000000000000 + $count_start;

on the old machine i see:
1000000000000010594

on the new i see:
1.0E+18

why?

thanks...

Weedpacket

Did you change the precision setting in php.ini?

Incidentally, if those are the sort of numbers you're working with, then you should use the bcmath functions to retain accuracy.

toshog

Weedpacket;10920010 wrote:
Did you change the precision setting in php.ini?

no.. i have:
precision = 12.
but these are real numbers, there is no decimal points....

toshog

so how do i solve this?

thanks...

Weedpacket

toshog wrote:
no.. i have:
precision = 12.

The default is 14, but neither is enough to display an eighteen-digit number with eighteen digits of precision. precision=12 rounds the display off to twelve digits of precision.

but these are real numbers, there is no decimal points....

There are decimal points: 1000000000000000000 is too large to fit into an integer so PHP converts it to a double (unless your old machine had a 64-bit processor and a custom-compiled 64-bit version of PHP, while the new version is only 32-bit).

Are you actually doing arithmetic here, or just padding a string of digits? If it's the latter then you should just treat it as a string. If it is arithmetic, see my previous post.

5.2.10

You know 5.3 is already out, don't you?

toshog

Weedpacket;10920123 wrote:
(unless your old machine had a 64-bit processor and a custom-compiled 64-bit version of PHP, while the new version is only 32-bit)

you just confirmed my worst fear...