Description:
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When running CLI with the -i or -m flags, one has to specify -c before those to use a custom ini file, otherwise the specified configuration will not be used, e.g.

    php -i -c /etc/php7/fpm/php.ini | grep "Loaded Configuration File"
    Loaded Configuration File => /etc/php7/cli/php.ini
    
    php -c /etc/php7/fpm/php.ini -i | grep "Loaded Configuration File"
    Loaded Configuration File => /etc/php7/fpm/php.ini

This is because -i and -m will immediately execute instead of processing and config flags:

https://github.com/php/php-src/blob/2349332b664887474ed2fb09dcdc4c57d8bb2b85/sapi/cli/php_cli.c#L679-L738



Test script:
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Run from shell:

    php -i -c /etc/php/7.0/fpm/php.ini | grep "Loaded Configuration File"


Expected result:
----------------
Loaded Configuration File: /etc/php/7.0/fpm/php.ini


Actual result:
--------------
Loaded Configuration File => /etc/php/7.0/cli/php.ini