10up SSO button disappears after upgrading to PHP 8.1 about 10up-experience HOT 3 CLOSED

This is due to a change to the way static variables are handled in inherited class methods.

As of PHP 8.1.0, when a method using static variables is inherited (but not overridden), the inherited method will now share static variables with the parent method. This means that static variables in methods now behave the same way as static properties.

[Source]

I recommend converting the Singleton abstract class to a Trait (and longer-term moving away from the Singleton pattern generally).

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@claytoncollie Please test #119 when you get a chance.

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Thanks for the patch @johnwatkins0

I tested on PHP 8.1.9 and the SSO is now working again.

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