I don’t like obfuscation.
Because it is unprofessional – source can be simply opened, but server loaded and any troubleshooting and changes will be a problem
Because all obfuscated scripts which I ever meet is hodgie code. I don’t like stink people 
Because most code under obfuscation has some validation on external sites, which is increase the response time.
So there is simple deobfuscator:
- <?php
- $s = "eval(...);";
- while(strpos($s, 'eval')===0) {
- $s = substr_replace($s, 'print', 0, 4);
- ob_start();
- eval($s);
- $s = ob_get_contents();
- ob_end_clean();
- }
- print($s);
- ?>
If you find in the code eval function with some encrypting inside – just copy eval and all content into $s variable in the script above and run. The script print the original code.
If you need more help with deobfuscation – you are welcome.