[SOLVED] Poller broken after Ubuntu upgrade

[Oldskool]

Today I upgraded my Cacti server from the EOL Ubuntu 15.10 to 16.04, the latest LTS version.
This consequently broke my Cacti 0.8.8f install. I upgraded it to 0.8.8h, but it's still broken.

From searching around, I've read reports that Cacti doesn't seem to work with PHP7 yet, which is now the default PHP version on Ubuntu. So, I installed PHP 5.6 alongside PHP7, in the hope to get it up and running again, but it doesn't. The main problem I am facing is that the poller is dead. Whenever I run

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php5.6 poller.php --force -d

from my Cacti directory, it returns:

PHP Parse error: syntax error, unexpected 'new' (T_NEW) in /var/www/cacti/lib/adodb/adodb.inc.php on line 866

After that, it just starts idling, until it hits the 5 minute maximum exectution time limit and is then killed.
The cronjob also doesn't run (obviously) and keeps throwing this error in cacti.log:

08/03/2016 05:34:59 PM - POLLER: Poller[0] Maximum runtime of 298 seconds exceeded. Exiting.
08/03/2016 05:34:59 PM - SYSTEM STATS: Time:298.9329 Method:cmd.php Processes:1 Threads:N/A Hosts:18 HostsPerProcess:18 DataSources:334 RRDsProcessed:0

I've seen more reports about this specific error, but no real fixes or workarounds so far. I'm running PHP5.6 from Ondrej Sury's PHP repository:

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$ php5.6 -v
PHP 5.6.24-1+deb.sury.org~xenial+1 (cli) 
Copyright (c) 1997-2016 The PHP Group
Zend Engine v2.6.0, Copyright (c) 1998-2016 Zend Technologies
    with Zend OPcache v7.0.6-dev, Copyright (c) 1999-2016, by Zend Technologies

I'm not really sure if I can get the poller up and running again. Any clues?

[Oldskool]

I figured it out, I forgot to update the path to the PHP5.6 binary in my settings (settings.php?tab=path).
The poller now seems to be running again, hope this helps someone with a similar problem.