security - Extracting an unique identifier from a PC using PHP without PECL? -

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i need distribute php site , want control installation this, extract unique identifier based on hardware of machine site deployed , send identifier site validation.

how extract unique identifier without using win32 api pecl extension? can forward me guides or tutorials show how done?

if planning on limiting app can installed, have encode using zend guard. otherwise, no matter restrictions put in place, can removed.

heck, having encoded won't stop determined user getting source code.


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