Why do selectable versions of PHP support some extensions in some versions but not in others?

If some PHP extensions appear in your cPanel for some versions of PHP but not others, it is because the extension developers either stopped supporting the older versions or they have not implemented support for the newer versions yet. A perfect example is PHP 4.4. Very few extensions still support it. This can also be seen in the newest experimental version.

If you need a particular extension for your purposes and it is not yet supported in your selected PHP version, take a step back one version. After the extension developer has updated support for the newer version, you can then step the version back up and turn on the extension.
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