Common PHP 8.0 Compilation Error Messages
With PHP 8.0 closing on us, it is high time to check our code bases to see if they compile, at least. Here is a list of common PHP 8.0 compilation messages, and what do to with them.

The errors have been found on a corpus of 1756 PHP projects. Any emitted error was compared to the result of the PHP 7.4 compilation. This means that those errors are fatal in PHP 8, while they were absent, or a warning in PHP 7.4. In both cases, in PHP 7.4, it used to be possible to brush them under the carpet, but not in PHP 8.0 anymore.