Strict Standards: Only variables should be passed by reference in m_auth

Question

I am working on a login system for a project using MVC programming and ran into this error. Here is the code, the problem line is #31

This login system is a tutoria

Answer 1

This was likely fixed in PHP 5.4 as part of Function Array Dereferencing (FAD) (revision 300266).

Alternatively as workaround try adding extra brackets, e.g.

$stmt->bind_param("ss", $user, (md5($pass . $this->salt)));

which would dereference the method/function return, see: (<5.6) Occasionally significant parentheses.