Problem with PHP7.2 and Concrete5 version 5.6.3.5

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We got message from our provider that website will not be seen anymore because he is not PHP 7.2 compatible. Our site runs under Concrete5 version 5.6.2.1. On forum i found that we got to upgrade to 5.6.3.5 to avoid that problem. First time i try to upgrade i received a error, but second time it was ok and the site runs under 5.6.3.5. After changing the PHP version at our provider to PHP 7.2 we got only a blank page with a error: > Fatal error: Cannot unset $this in/customers/7/d/8/freeridersmc.be/httpd.www/updates/concrete5.6.3.5_remote_updater/concrete/libraries/3rdparty/adodb/adodb-xmlschema03.inc.php on line 178.
Site is now back running under old PHP, but provider will stop with this at the end of the year.
Can sombody help me ??

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mlocati replied on at Permalink Reply
mlocati
Geuze replied on at Permalink Reply
Thanks, i will try this, but first i gone search some specialst to join me when i'm doing this, i don't wanna loose my website.