fix php8.2: definition of property $created

[podolinek]

to avoid creating dynamic property

[podolinek]

PHPunit doesn't work for php7.2 and lower and for 7.3 some bugs in tests.

[mmcev106]

@podolinek, is this a duplicate of #370?

[podolinek]

Hah, duplicate, correct. But tests access to variable $created out of the class, so public required.

[mmcev106]

Thanks for the tip! I just changed it to public.