You dont need to change variable names before encoding, if you use something like ioncube it is solid. I am fairly up to date with web cracking and I am unaware of a functional way to reverse current versions of ioncube. Ioncube uses bytecode obfuscation which makes it practically impossible to turn back into PHP. Cracking the program to get past anti-pirating features is another story, there is no way to prevent that.
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