> There are literally companies stuck on PHP 7 because going to 8 is too painful.
Usually due to frameworks. Those tend to do play fast and loose with language constructs so small changes can make them not work anymore. And as those same framework will also break a lot more things between version, you cannot easily upgrade them, so you cannot upgrade your php version.
Currently maintaining an internal symfony 1 website so I know the pain. At least the documentation of old symfony is still available unlike many more modern frameworks.
Usually due to frameworks. Those tend to do play fast and loose with language constructs so small changes can make them not work anymore. And as those same framework will also break a lot more things between version, you cannot easily upgrade them, so you cannot upgrade your php version.
Currently maintaining an internal symfony 1 website so I know the pain. At least the documentation of old symfony is still available unlike many more modern frameworks.