Is there any server configuration or anything that make __DIR__ failed

I have develop a framework where most of its path depend on __DIR__. Is there any开发者_Go百科 server configuration or anything that would make __DIR__ unreliable?

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Not having PHP 5.3 would be a deal breaker. You could use dirname(__FILE__) if you don't want to require 5.3.

Other than that, no, it should always be available.