Undefined function sha256()

You can use

hash( 'sha256', $string );

php cryptography undefined trim sha256

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

With the extension installed:

<?phpvar_dump(function_exists('sha256'));?>bool(true)

php cryptography undefined trim sha256

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

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

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