Undefined PHP function filter

I am trying to use the predefined function in PHP filter_input

But I get the following: Call to undefined function filter_input()...

The line it fails on is:

$email = filter_input(INPUT_POST, 'email', FILTER_SANITIZE_EMAIL);

I can confirm there is a $_POST['email'] that has a value and that I am using PHP 5.5.12 and the filter extension was enabled by default in 5.2.0 .

I'm not sure what I am missing to access the function that should be already accessible.

    $error_msg = "";

    if (isset($_POST['email'], $_POST['p'])) {
        // Sanitize and validate the data passed in
        $email = filter_input(INPUT_POST, 'email', FILTER_SANITIZE_EMAIL);
        $email = filter_var($email, FILTER_VALIDATE_EMAIL);
        if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
            // Not a valid email
            $error_msg .= 'The email address you entered is not valid
';
    }

        $password = filter_input(INPUT_POST, 'p', FILTER_SANITIZE_STRING);
    }

There isn't much code. It doesn't make it too far yet...

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