MW-API + Httpful

    // Login request
    $sRequestUrl = 'http://MYURL/w/api.php?action=query&meta=tokens&type=login&format=json';
    $oResponse = Request::post($sRequestUrl)
        ->addHeader('User-Agent', 'MYUSERAGENT')
        ->expectsJson()
        ->send();
    $sLoginToken = $oResponse->body->query->tokens->logintoken;
    $oHeader = current($oResponse->headers);
    $sCookie = $oHeader['set-cookie'];

    // Login confirm
    $sRequestUrl = 'http://MYURL/w/api.php?action=login&format=json';
    $aBodyData = array(
        'lgname' => 'MYUSER@MYBOT',
        'lgpassword' => 'MYBOTPASSWORD',
        'lgtoken' => $sLoginToken
    );
    $oResponse = Request::post($sRequestUrl)
        ->addHeader('User-Agent', 'MYUSERAGENT')
        ->addHeader('Cookie', $sCookie)
        ->expectsJson()
        ->body(http_build_query($aBodyData))
        ->send();