You are right, going from 4 to 8 is a huge challenge.
Minor point: classes are using the same syntax but you are right they typically won't work because the constructor have changed, in PHP4 it was a function named the same as the class, in PHP5 and on it's __construct, the PHP4 version was deprecated in PHP 7 and removed in PHP 8.0.
create_function is just gone. So is each(). Oh and HTTP_RAW_POST_DATA. The list is long.
If you have used == and in PHP4 we did that, come on, don't be holier than holy and claim you only used === in PHP4 then PHP8 will have some surprises for you.
In my experience rector became usable last year-ish, if you tried before, give it another whirl.
Minor point: classes are using the same syntax but you are right they typically won't work because the constructor have changed, in PHP4 it was a function named the same as the class, in PHP5 and on it's __construct, the PHP4 version was deprecated in PHP 7 and removed in PHP 8.0.
create_function is just gone. So is each(). Oh and HTTP_RAW_POST_DATA. The list is long.
If you have used == and in PHP4 we did that, come on, don't be holier than holy and claim you only used === in PHP4 then PHP8 will have some surprises for you.
In my experience rector became usable last year-ish, if you tried before, give it another whirl.