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Unable to upgrade forum as IPB 4.7.1 does not support PHP 8.0 and the upgrade requires PHP 8.0

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I am trying to upgrade the forum but discovered that this seems to be impossible.

I am currently on 4.7.1 which does not support PHP 8.0 and the automated upgrade path only works if PHP 8.0 is installed.

So, I am not in a situation where there is no possible path forward for the upgrade. Here is the error message when switching to a newer PHP.


Error: Call to undefined function create_function() (0)

#0 [...]public_html/conf_global.php(172): IPB_Firewall::_calculateChecksums(Array, 0)

#1 [...]public_html/conf_global.php(144): IPB_Firewall::_doSecurityChecks()

#2 [...]public_html/conf_global.php(376): IPB_Firewall::run()

#3 [...]public_html/system/Dispatcher/Dispatcher.php(69): require('/home/customer/...')

#4 [...]public_html/admin/index.php(13): IPS\_Dispatcher::i()

#5 {main}

The forum does not run any third-party extensions or plugins.

What's the solution?

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