setcookie not working

I know there was a TONS of similar quesitons here, but I've tried already all suggestions posted in other questions, and nothing helped.

This is my function:

function makecookie($s, $d) {
    if(empty($_COOKIE[@COOKIE_PATH . "[{$s}]"])) {
        setcookie(@COOKIE_PATH . "[{$s}]", $d);
    }

    return true;
}

At the top of the document I got: ob_start(); and at the end of the document I got ob_end_flush();.

When I try: echo setcookie(@COOKIE_PATH . "[{$s}]", $d); exit;

It returns 1 what means 'true'. And cookie has been 开发者_StackOverflow中文版not set.

So why does it happen?

Once the cookie is set, you can retrieve it on next page load with $_COOKIE["name of cookie"]

@COOKIE_PATH doesn't look like valid/sensible PHP. Are you sure that isn't some sort of typo for (say) $COOKIE_PATH?