No, bootstrapping is not a part of PHP. Rather it is a file that is generally ran at installation time, or with PHP for every request, that takes care of making sure everything is included and general startup procedures are taken care of.
“Bootstrapping” comes from the term “pulling yourself up by your own bootstraps.” That much you can get from Wikipedia. In computing, a bootstrap loader is the first piece of code that runs when a machine starts, and is responsible for loading the rest of the operating system. In modern computers it’s stored in ROM, but … Read more