I have called hash function in my code like (php version 5.2.14 )
$username =hash("sha256",trim($_POST['username'])); $password =hash("sha256",trim($_POST['password'])); but I got error like Call to undefined function hash() in /var/www/site/ What to do ?
It means it cannot find the function hash(). Checking the manual I see this:
(PHP 5 >= 5.1.2, PECL hash >= 1.1) What php version do you run? Try:
<? phpinfo() ?> To check. If it is lower then 5.1.2 you do not have the hash() function available
'hash()' was introduced in PHP 5.1.2, so it's possible you have an older version.
Check your PHP version because the hash function is only available for version PHP 5 >= 5.1.2 with PECL hash >= 1.1
If your version of PHP > 5.1.2, then enable the hash extension by uncommenting its line in the php.ini config file in use and restarting the web server
If you do have an older version, you can still revert to the sha1 or sha256 functions as follows:
$username = sha1(trim($_POST['username'])); $password = sha1(trim($_POST['password'])); OR
$username = sha256(trim($_POST['username'])); $password = sha256(trim($_POST['password'])); HOWEVER there is a good argument about both here: SHA1 vs md5 vs SHA256: which to use for a PHP login?
