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I am currently using PHP 5.6.8 on Windows Server 2008 R2 and IIS. I do not use Apache or Mysql. <br />
<br />
How difficult is it to upgrade to PHP 7?<br />
<br />
What should I backup?<br />
<br />
How hard is it to restore if things mess up?<br />
<br />
Any tips, tricks, or hints would be greatly appreciated.
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I am currently using PHP 5.6.8 on Windows Server 2008 R2 and IIS. I do not use Apache or Mysql. 

How difficult is it to upgrade to PHP 7?

What should I backup?

How hard is it to restore if things mess up?

Any tips, tricks, or hints would be greatly appreciated.

Upgrade to PHP7 on Windows Server 2008 R2

PHP is a widely-used server-side scripting language especially suited for web development, powering tens of millions of sites from Facebook to personal WordPress blogs. PHP is often paired with the MySQL relational database, but includes support for most other mainstream databases. By utilizing different Server APIs, PHP can work on many different web servers as a server-side scripting language.