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- [Margin Loan Borrow Buy Sell Repay](./examples/php/)
```php
<?php
namespace ccxt;
include_once (__DIR__.'/../../ccxt.php');
// ----------------------------------------------------------------------------
// PLEASE DO NOT EDIT THIS FILE, IT IS GENERATED AND WILL BE OVERWRITTEN:
// https://github.com/ccxt/ccxt/blob/master/CONTRIBUTING.md#how-to-contribute-code
// -----------------------------------------------------------------------------
error_reporting(E_ALL);
date_default_timezone_set('UTC');
use ccxt\Precise;
use React\Async;
use React\Promise;
// AUTO-TRANSPILE //
// Note, this is just an example and might not yet work on other exchanges, which are being still unified.
function example() {
// ########## user inputs ##########
return Async\async(function () {
$exchange_class = '\ccxt\async\\'.'binance';
$exchange = new $exchange_class(array(
'apiKey' => 'xxx',
'secret' => 'xxx',
));
$symbol = 'BUSD/USDT'; // set target symbol
$margin_mode = 'isolated'; // margin mode (cross or isolated)
$collateral_coin = 'USDT'; // which asset you want to use for margin-borrow collateral
$borrow_coin = 'BUSD'; // which coin to borrow
$order_side = 'sell'; // which side to trade
$amount_to_trade = 14; // how many coins to sell
$order_type = 'limit'; // order type (can be market, limit or etc)
$limit_price = 0.99; // price to sell at (set undefined/null/None if market-order)
$margin_magnitude = 5; // target margin (aka 'leverage'). This might also be obtainable using other unified methods, but for example purposes, we set here manually
// ########## end of user-inputs ##########
//
// for example purposes, let's also check available balance at first
$balance_margin = Async\await($exchange->fetch_balance(array(
'defaultType' => 'margin',
'marginMode' => $margin_mode,
))); // use `defaultType` because of temporary bug, otherwise, after several days, you can use `type` too.
// if we don't have enought coins, then we have to borrow at first
$needed_amount_to_borrow = null; // will be auto-set below
if ($amount_to_trade > $balance_margin[$symbol][$borrow_coin]['free']) {
$needed_amount_to_borrow = $amount_to_trade - $balance_margin[$symbol][$borrow_coin]['free'];
var_dump('hmm, I have only ', $balance_margin[$symbol][$borrow_coin]['free'], ' ', $borrow_coin, ' in margin balance, and still need additional ', $needed_amount_to_borrow, ' to make an order. Lets borrow it.');
// To initate a borrow, at first, check if we have enough collateral (for this example, as we make a sell-short, we need '-1' to keep for collateral currency)
$needed_collateral_amount = $needed_amount_to_borrow / ($margin_magnitude - 1);
// Check if we have any collateral to get permission for borrow
if ($balance_margin[$symbol][$collateral_coin]['free'] < $needed_collateral_amount) {
// If we don't have enough collateral, then let's try to transfer collateral-asset from spot-balance to margin-balance
var_dump('hmm, I have only ', $balance_margin[$symbol][$collateral_coin]['free'], ' in balance, but ', $needed_collateral_amount, ' collateral is needed. I should transfer ', $needed_collateral_amount, ' from spot');
// let's check if we have spot balance at all
$balance_spot = Async\await($exchange->fetch_balance(array(
'type' => 'spot',
)));
if ($exchange->parse_number($balance_spot[$collateral_coin]['free']) < $needed_collateral_amount) {
var_dump('hmm, I neither do have enough balance on spot - only ', $balance_spot[$collateral_coin]['free'], '. Script can not continue...');
return;
} else {
var_dump('Transferring ', $needed_collateral_amount, ' to margin account');
Async\await($exchange->transfer($collateral_coin, $needed_collateral_amount, 'spot', $margin_mode, array(
'symbol' => $symbol,
)));
}
}
// now, as we have enough margin collateral, initiate borrow
var_dump('Initiating margin borrow of ', $needed_amount_to_borrow, ' ', $borrow_coin);
$borrow_result = Async\await($exchange->borrow_margin($borrow_coin, $needed_amount_to_borrow, $symbol, array(
'marginMode' => $margin_mode,
)));
}
var_dump('Submitting order.');
$order = Async\await($exchange->create_order($symbol, $order_type, $order_side, $amount_to_trade, $limit_price, array(
'marginMode' => $margin_mode,
)));
var_dump('Order was submitted !', $order['id']);
//
//
// ...
// ...
// some time later, if you want to repay the loan back (like 'close the position')...
// ...
// ...
//
//
// set the "repay-back" amount (for this example snippet, this will be same amount that we borrowed above)
if ($needed_amount_to_borrow !== null) {
$amount_to_repay_back = $needed_amount_to_borrow;
// At first, you need to get back the borrowed coin, by making an opposide trade
var_dump('Making purchase back of ', $amount_to_repay_back, ' ', $borrow_coin, ' to repay it back.');
$purchase_back_price = 1.01;
$order_back = Async\await($exchange->create_order($symbol, $order_type, ($order_side === 'buy' ? 'sell' : 'buy'), $amount_to_repay_back, $purchase_back_price, array(
'marginMode' => $margin_mode,
)));
var_dump('Now, repaying the loan.');
$repay_result = Async\await($exchange->repay_margin($borrow_coin, $amount_to_repay_back, $symbol, array(
'marginMode' => $margin_mode,
)));
var_dump('finished.');
}
}) ();
}
Async\await(example());
```