Description:
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I would like to use multiple different user.ini-Files in the same directory to modify some php.ini settings. I'm using Apache with mod_fastcgi, and therefore, as far as I can tell, I can't insert line breaks into variables with setenv, and teherefore I'm limited to at most one PHP_VALUE that I can define per vhost. This would be sufficient to set user_ini.filename to a suitable different file and set any values in there.

However, php_cgi_ini_activate_user_config() in sapi/fpm/fpm/fpm_main.c only evaluates the path, not the current value of user_ini_filename when retrieving cached entries. As a result, all requests hitting a given instance within the expiry period will receive the values valid for the user_ini.filename specified in the first request, which may or may not be the same as the one defined for the current request.