sha1 is not working in password encryption

I am using sha1 encryption for encrypting my password, but I am facing problem with that. For some users, login is not working.

my code,(in sign up)

// all validation is done here
$password = sha1($_POST['password']);

// inserting data is here

in login my query is

$email     = $_POST['email'];
$password  = sha1($_POST['password']);

select * from users where email = $email and password = $password and status = 1 and deleted = 0;

one of the user facing problem with password,

im$$man

Am I doing some thing wrong.

please help me.

Solution

Well the problem is here,

sha1 treats $man in im$$man as variable, so it will be evaluated as null since you dont have any value for that.

some thing like this,

sha1("im$$man");// will echo 17cf5ec2752a9a7f0077c904f60b64f23ba2534d

is also equal to

sha1("im$");// will echo 17cf5ec2752a9a7f0077c904f60b64f23ba2534d
$man is evaluated to null.

Output is same for both the input(input is different though)

To get expected result, avoid double quotes there,

sha1('im$$man');// this will give correct output

Output is

850caa44549443778fe005f466766d5d6d413692// correct output.