PHP is the programming language which is used to build the WordPress CMS. It was originally created in 1994, has been developed constantly over the years, and has gone through several major versions. The latest, PHP7, being the most robust and powerful version yet. However, millions of people are still using older, less secure versions of PHP on their servers to power websites.
This raises a few issues for those people. When you run an outdated PHP version, you can’t take advantage of the latest features that have been built into the language, and you’re not protected against security vulnerabilities that can be exploited by hackers.
This is why it’s super important that you stay up to date with the latest version. It’s also not so straightforward to update your version to a newer one, so that’s where the PHP Upgrade Bar comes in.
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