Add event listening

[digitaldonkey]

https://ethereum.stackexchange.com/questions/2556/how-can-i-trigger-a-php-script-when-a-transaction-is-received

[digitaldonkey]

We actually have that now technically in the Library.
You can pass any FilterChange with your contract to get the Event data.

SmartContract->processLog(FilterChange $filterChange)

But Even better, related to above I wrote some event listener which allows you to

• Process blocks from Block 0 to Blocks in the future
• Use a PHP script to react on any new TX happening onChain

Please check out https://github.com/digitaldonkey/ethereum-php-eventlistener
It has plenty of examples

ethereum-php/src/SmartContract.php

Lines 98 to 124 in 99599d0

	/**
	* @param \Ethereum\DataType\FilterChange $filterChange
	* @throws \Exception
	*
	* @return \Ethereum\EmittedEvent with emitted Data.
	*/
	public function processLog(FilterChange $filterChange) {
	if ($filterChange->address->hexVal() !== $this->contractAddress) {
	return null;
	}
	if (is_array($filterChange->topics)) {
	$topic = $filterChange->topics[0]->hexVal();
	if (isset($this->events[$topic])) {
	$transaction = $this->eth->eth_getTransactionByHash($filterChange->transactionHash);
	// We have a relevant event.
	$event = new EmittedEvent($this->events[$topic], $filterChange, $transaction);
	// Process onEventName handler.
	if (method_exists($this, $event->getHandler())) {
	call_user_func([$this, $event->getHandler()], $event);
	}
	return $event;
	}
	}
	return null;
	}