Monitoring an Ethereum Address for Transaction Confirmations in PHP

To monitor an Ethereum address and track the number of confirmations a transaction has, you will need to use the [Ethers.js]( library, which provides a simple way to interact with the Ethereum blockchain. In this article, we will explore how to do this using PHP.

Setting Up Ethers.js in PHP

First, install the ethers.js package globally using Composer:

composer require ethers-js

Next, create a new PHP file (e.g. ethereum_monitor.php) and add the following code:

use Ethers\ wallets\ Wallet;
use Ethers\ providers\ HttpProvider;
use Ethers\ providers\ WebSocketProvider;
class EthereumMonitor {
private $walletAddress;
private $providerUrl;
public function __construct($walletAddress, $providerUrl) {
$this->walletAddress = $walletAddress;
$this->providerUrl = $providerUrl;
}
public function getChainId() {
// Ethers.js automatically sets the chain ID to 1 for us
return 1;
}
public function waitForTransactionConfirmation($address, $amount) {
while (true) {
try {
// Check if we have a valid wallet instance
$wallet = new Wallet($this->walletAddress);
// Get the transaction object using Web3.js
$tx = $wallet->transaction($address, $amount);
// Get the transaction hash and timestamp
$hash = $tx->hash;
$timestamp = $tx->timestamp;
// Check if there is a confirmation for the transaction
if ($tx->confirmation > 0) {
return true; // The transaction has at least one confirmation
} else {
// If no confirmation is found, wait and try again
echo "The transaction with address $address has not reached confirmation: " . json_encode($hash) . "\n";
sleep(1); // Wait 1 second before checking again
}
} catch (Exception $e) {
echo "An error occurred while waiting for transaction confirmation: " . $e->getMessage() . "\n";
break;
}
}
return false; // Transaction did not reach any confirmation
}
}
// Usage example:
$walletAddress = '0x1234567890abcdef';
$providerUrl = '
$monitor = new EthereumMonitor($walletAddress, $providerUrl);
echo "Transaction confirmation: " . ($monitor->getChainId() == 1 ? 'Yes' : 'No') . "\n";

In this example, we create an instance of the EthereumMonitor class with our wallet address and provider URL. We then use a while loop to check for transaction confirmations every second using the waitForTransactionConfirmation method.

How ​​it works

• The Ethers.js library automatically sets the chain ID to 1.

• We use the walletAddress instance to get a valid transaction object using Web3.js.

• We retrieve the transaction hash and timestamp from the transaction object.

• If there is a confirmation for the transaction (e.g. tx->confirmation > 0), we return true. Otherwise, we wait and retry after waiting 1 second.

Please note that this implementation assumes that you have an Infura project configured with your Ethereum network provider URL. You can find more information on how to get started with Ethers.js and Web3.js in the official documentation: <

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