vTiger with PHP 5.4 ( session_unregister function removed)

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With PHP 5.4 onwards the session_unregister function is removed. This means that you will get a “Fatal error: Call to undefined function session_unregister()”

vTiger 5.4 (the version number is just happen stance and has no relation to the PHP version number) code needs the following cludge to get around this. In /modules/Users/Authenticate.php around about line 69 then do the following change,

//Security related entries end
// TODO: session_unregister was removed in php 5.4.0 so must remove this backwards compatibility switch.
if (function_exists('session_unregister')) {
    session_unregister('login_password');
    session_unregister('login_error');
    session_unregister('login_user_name');
} else {
    unset($_SESSION['login_password']);
    unset($_SESSION['login_error']);
    unset($_SESSION['login_user_name']);
}