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README.md

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@ -176,6 +176,23 @@ $contract->bytecode($bytecode)->estimateGas($params, $callback);
$contract->bytecode($bytecode)->estimateGas($functionName, $params, $callback);
```
# Assign value to outside scope(from callback scope to outside scope)
Due to callback is not like javascript callback,
if we need to assign value to outside scope,
we need to assign reference to callback.
```
$newAccount = '';
$web3->personal->newAccount('123456', function ($err, $account) use (&$newAccount) {
if ($err !== null) {
echo 'Error: ' . $err->getMessage();
return;
}
$newAccount = $account;
echo 'New account: ' . $account . PHP_EOL;
});
```
# Examples
To run examples, you need to run ethereum blockchain local (testrpc).