$val = getInnerStr($contents, '<span id="ctl00_M_lblToAmount">', '<');
        $val = str_replace (',', '', $val);

        $val = getInnerStr($contents, "1 $curr_b = ",$curr_a);

$xr_providers = array("ECB", "EXCHANGE-RATES.ORG", "GOOGLE", "YAHOO", "BLOOMBERG");

Yahoo
Undefined offset: 1 in file: C:\wamp3\www\account24\gl\includes\db\gl_db_rates.inc at line 228
Google
Cannot retrieve exchange rate for currency GBP. Please adjust approximate rate if needed.
Bloomberg
Cannot retrieve exchange rate for currency GBP. Please adjust approximate rate if needed.

$xr_providers = array("ECB", "EXCHANGE-RATES.ORG", "CCA", "YAHOO", "GOOGLE", "BLOOMBERG");

https://free.currencyconverterapi.com/api/v5/convert?q=USD_EUR&compact=y

{"USD_EUR":{"val":0.875505}}

$xr_providers = array("ECB", "YAHOO", "GOOGLE", "BLOOMBERG", "CCA");

function get_extern_rate($curr_b, $provider = 'ECB', $date)
{
    global    $path_to_root;

    if ($date != Today())    // no historical rates available
        return 0;

    $contents = '';
    $proto = 'http://';
    $curr_a = get_company_pref('curr_default');
    if ($provider == 'ECB')
    {
        $filename = "/stats/eurofxref/eurofxref-daily.xml";
        $site = "www.ecb.europa.eu";
        $site_ip="172.230.157.137";
    }
    elseif ($provider == 'YAHOO')
    {
        $filename = "/d/quotes.csv?s={$curr_a}{$curr_b}=X&f=sl1d1t1ba&e=.csv"; // new URL's for YAHOO
        $site = "download.finance.yahoo.com";
        $site_ip="203.84.220.151";
    }
    elseif ($provider == 'GOOGLE')
    {
        $filename = "/bctzjpnsun/converter?a=1&from={$curr_a}&to={$curr_b}";
        $site = "finance.google.com";
    }
    elseif ($provider == 'BLOOMBERG')
    {
        $filename = "/quote/{$curr_b}{$curr_a}:CUR";
        $site = "www.bloomberg.com";
        $proto = 'https://';
        $contents=file_get_contents($proto.$site.$filename);
    }
    elseif ($provider == 'CCA') //free.currencyconverterapi.com
    {
        $filename = "/api/v5/convert?q={$curr_b}_{$curr_a}&compact=y";
        $site = "free.currencyconverterapi.com";
        $proto = 'https://';

    }
    if (empty($contents)) {
        if (function_exists('curl_init'))
        {    // first check with curl as we can set short timeout;
            $retry = 1;
             do {
                   $ch = curl_init();
                   curl_setopt ($ch, CURLOPT_URL, $proto.$site.$filename);
                   curl_setopt ($ch, CURLOPT_COOKIEJAR, VARLIB_PATH."/cookie.txt");
                   curl_setopt ($ch, CURLOPT_HEADER, 0);
                   curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
                   // prevent warning while safe_mode/open_basedir on (redirection doesn't occur at least on ECB page)
                   if (!ini_get('safe_mode') && !ini_get('open_basedir'))
                       curl_setopt ($ch, CURLOPT_FOLLOWLOCATION, 1);
                   curl_setopt ($ch, CURLOPT_TIMEOUT, 3);
                   $contents = curl_exec ($ch);
                   curl_close($ch);
                // due to resolver bug in some curl versions (e.g. 7.15.5)
                // try again for constant IP.
                if (isset($site_ip))
                       $site=$site_ip;
               } while( ($contents == '') && $retry--);
        } else {
            $contents = url_get_contents($proto.$site.$filename);
        }
    }
    $val = '';
    if ($provider == 'ECB')
    {
        $contents = str_replace ("<Cube currency='USD'", " <Cube currency='EUR' rate='1'/> <Cube currency='USD'", $contents);
        $from_mask = "|<Cube\s*currency=\'" . $curr_a . "\'\s*rate=\'([\d.,]*)\'\s*/>|i";
        preg_match ( $from_mask, $contents, $out );
        $val_a = isset($out[1]) ? $out[1] : 0;
        $val_a = str_replace ( ',', '', $val_a );
        $to_mask = "|<Cube\s*currency=\'" . $curr_b . "\'\s*rate=\'([\d.,]*)\'\s*/>|i";
        preg_match ( $to_mask, $contents, $out );
        $val_b = isset($out[1]) ? $out[1] : 0;
        $val_b = str_replace ( ',', '', $val_b );
        if ($val_b)
        {
            $val = $val_a / $val_b;
        }
        else
        {
            $val = 0;
        }
    }
    elseif ($provider == 'YAHOO')
    {
        $array = explode(',',$contents); // New operations for YAHOO. Safer.
        $val = $array[1];
        if ($val != 0)
            $val = 1 / $val;
    }
    elseif ($provider == 'GOOGLE')
    {
        $val = getInnerStr($contents, '<span class=bld>', ' ');
        if (empty($val) || $val+0 <= 0.0001) {
            // reverse lookup on could not convert for too small values
            $filename = "/bctzjpnsun/converter?a=1&from={$curr_b}&to={$curr_a}";
            $contents = url_get_contents($proto.$site.$filename);
            $val = getInnerStr($contents, '<span class=bld>', ' ');
        } else {
            if ($val != 0)
                $val = 1 / $val;
        }
    }
    elseif ($provider == 'BLOOMBERG')
    {
        $val = getInnerStr($contents, ',"price":', ',"');
    }
    elseif ($provider == 'CCA')
    {
        $rates = json_decode($contents, true);
        $val = $rates[$curr_b.'_'.$curr_a]['val'];
      }
    return $val;
}  /* end function get_extern_rate */

    if ($provider == 'ECB')
    {
        $filename = "/stats/eurofxref/eurofxref-daily.xml";
        $site = "www.ecb.europa.eu";
        $proto = 'https://';
        $site_ip="172.230.157.137";
        $contents=file_get_contents($proto.$site.$filename);
    }