What Extensions are Available for PHP Hosting?
There are three extensions available for PHP users. PHP extensions are features and operations that add extra functionality.
The first kind of extension is an extension to the Zend Engine. The Zend Engine is what PHP runs on, and what executes the PHP scripts. By changing the Zend Engine, the way PHP operates changes too. This is not always advisable because it can make the Zend Engine incompatible with many servers and can cause unpredictable behavior occurring from the PHP script.
Next, there are built-in extensions. These are written directly the PHP software. This can be both expedient and time consuming for the programmer. Although you don’t have to manually install these extensions, if you were to make any changes to the extension the PHP would have to be completely reinstalled.
The final option for PHP hosting is an external extension. This prevents complications with compatibility or excessive reinstallations of the PHP as the extension is perfected but will cause slower web pages as the extension is loaded each time a consumer requests the web page to load.

