base_convert() not working correctly?

grwd

base_convert() does not seem to be working as I expected.

I ran the following code:

	$ccNumStr = "5555444433331111";
	echo "CC#: ".$ccNumStr;

$encrypt = base_convert($ccNumStr,10,36);
echo " <P>Encrypt: ".$encrypt;

$decrypt = base_convert($encrypt,36,10);
echo " <P>Decrypt:  ".$decrypt." <P>";

Ans I got the following results:

CC#: 5555444433331111
Encrypt: cesv7b0f53
Decrypt: 2498396201895

So did I do something wrong?
Or is base_convert() malfunctioning?

jordy

I ran the same code with the following result:

CC#: 5555444433331111
Encrypt: 1ip8nxua3s7

Decrypt: 5555444433331111

Strange that it is not working correctly with you.. what you can try is to lower the tobase number (currently 36) to a lower number.. and btw.. can you post your (full) php version with platform?

(tested on:
RedHat 7.1
Apache 1.3.27
Php 4.1.2
)

TheDefender

Worked just fine for me too...

WinXP, Apache 2.0.49, PHP 4.3.7, IE6 xpsp2 with 128bit encryption.

grwd

I'm using a Win98 textbox
Apache 2.0.?
PHP4.?
Netscape 7.0

Pls forgive my ignorance - but WHERE do I find specific version info for Apache and PHP?

FYI: Only Base 2 gives me the correct decrypt.
Also if I reduce the number to 9 or less characters it gives me the correct decrypt.
Wierd, wierd, wierd!

Weedpacket

Originally posted by grwd
Pls forgive my ignorance - but WHERE do I find specific version info for Apache and PHP?

Like many Un*x-world apps, you can go

php --help

Apache has a similar command-line option ( -h ).

And in PHP itself you can use [man]phpinfo/man.

Also if I reduce the number to 9 or less characters it gives me the correct decrypt.

That makes it sound like you're converting the $ccNumStr to an integer at some point before you get around to "encrypting" it. 32-bit integers can only hold numbers up to 2,147,483,647 and to go higher PHP uses doubles.