Undefined function sha256()

Question

I have this php code:

$password = sha256($_POST['password']);

but when I run this code it says:

Fatal error: Call to undefined function sha256() in .... on line ...ix it as

What is wrong with this code and what must I do to fix this as I know that sha256 exists.

I have also tried:

$password = sha256(trim($_POST['password']));

But that doesn't work either.

You may think that `sha256` exists; the fact is, however, that it doesn't. Where is it defined? Why not use `hash('sha256', ...`? — lonesomeday, Dec 16 '11 at 11:30

score 41 · Accepted Answer · answered Dec 16 '11 at 11:29

41

You can use

hash( 'sha256', $string );

answered Dec 16 '11 at 11:29

DarkDevine

score 5 · Answer 2 · edited Oct 20 '12 at 03:51

5

The Suhosin extension adds the function sha256(), and even sha256_file(), to the PHP Core.

With the extension installed:

<?php
var_dump(function_exists('sha256'));
?>

bool(true)

edited Oct 20 '12 at 03:51

newfurniturey

answered May 18 '12 at 13:41

Goran Miskovic

score 3 · Answer 3 · edited Dec 16 '11 at 11:44

3

There is no such function in php standard library. Use hash function instead. http://php.net/manual/en/function.hash.php like :

$pass = hash('sha256', $_POST['password']);

edited Dec 16 '11 at 11:44

Yuck

answered Dec 16 '11 at 11:32

Wieszos

score 0 · Answer 4 · answered Dec 16 '11 at 11:30

0

ehrm. That function doesn't exist. If you want to use the SHA256 algorithm, use hash instead.

answered Dec 16 '11 at 11:30

Berry Langerak

4 Answers4