PHP persistent database connections are handled by each database module itself and have nothing to do with code caching.

I believe that your informant is quite wrong about PHP scoping problems with code caching. Perhaps the person meant something related to stupid old bugs like this: Bug #5875 APC removes $_SERVER from global scope. Note the

In reply to Re^4: How to Fix CGI by Anonymous Monk
in thread How to Fix CGI by arkturuz

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