function find_rate($exchange, $min, $max, $step = 1, $oper = 'asks')
{
$best_rate = 1.0E+100;
$cmp = strcmp($oper, 'asks');
if ($cmp != 0) {
$best_rate = 1.0 / $best_rate;
}
$best = array();
$currency_pair = array($exchange[2], 'BTC');
$book_from = $exchange[0];
$fee_from = $exchange[1];
for ($value = $min; $value <= $max; $value += $step) {
$bought = getValueOrders($value, $currency_pair, $book_from, $fee_from, $oper);
$rate = $bought['initial'] / $bought['withdrawn'];
if ($bought !== false && $rate > 0) {
if ($cmp == 0 && $rate < $best_rate || $cmp != 0 && 1.0 / $rate < 1.0 / $best_rate) {
$best = $bought;
$best_rate = $rate;
}
}
if ($bought === false) {
//print "Broken at $value\n";
break;
}
}
return array($best_rate, $best);
}
function buildDetailedExchangeMap($value, $pair)
{
$book_from = $pair[0][0];
$fee_from = $pair[0][1];
$currency_pair_from = array($pair[0][2], 'BTC');
$bought = getValueOrders($value, $currency_pair_from, $book_from, $fee_from, 'asks');
if ($bought === false) {
return false;
}
$book_to = $pair[1][0];
$fee_to = $pair[1][1];
$currency_pair_to = array('BTC', $pair[1][2]);
$sold = getValueOrders($bought['withdrawn'], $currency_pair_to, $book_to, $fee_to, 'bids', false);
if ($sold === false) {
return false;
}
$results = array('origin' => array('name' => $pair[0][3], 'results' => $bought), 'destination' => array('name' => $pair[1][3], 'results' => $sold), 'rate' => $bought['initial'] / $sold['withdrawn'], 'rate_no_withdrawal' => $bought['initial'] / $sold['bought']);
return $results;
}
