Obfuscated php scripts can be expected to work wherever PHP is available. The obfuscated scripts themselves are valid php code which any php interpreter will be able to execute.
Can I encrypt Php function files/scripts? Yes, you can. Php function files are obfuscated just like any php script. And yes, you can expect the obfuscated function files to operate exactly as the original, plain text version.
Is there a size limit on the type of PHP scripts (.php) that can be obfuscated / encrypted? No, there is not. The sizes of your php scripts are irrelevant. The obfuscation process may take a few seconds longer for scripts that are unusually large versus smaller scripts.
Prevent modifications to commercial php scripts. Ensure protected php code is well hidden and never available to be public to be tampered with.
Retain the ability to sell or share your php code, without having to worry about theft of intellectual property.
Once your protected script has been shared with the outside world, this feature (if enabled) allows you to gather metrics on how it is being used. Quickly identify/pinpoint users with nefarious intentions.
Regulate when protected .php scripts can be executed. Specify periods during which protected scripts are authorized to run. Abort all executions that happen outside of the set time window.
Retain 100% control on the list of users authorized to use any of your protected commercial php scripts.
Regulate precisely how many list of hosts your php code can be utilized on.