Description:
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From manual page: http://www.php.net/install.fpm.configuration
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It was unclear for me where to lookup information for the "include" directive. I could not find it in the global php.ini directives nor the FPM configuration docs. From the example php-fpm.conf file, I could guess that it's a glob pattern although I could not be sure of that.

Digging in the source code showed that the include path is treated in a special way, absolute paths are taken as is, non-absolute paths (without leading /) are processed with a prefix (which one?).