Description:
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Hi

We are trying to benchmark PHP performance under IIS. We noticed that PHP is trying to chdir to script directory and that is causing a lot of contention because it's IO bound.

To workaround this. I tried to pass "-C" option to php-cgi.exe. (Process run as: "php-cgi.exe -C" However, I am still observing chdir taking place.

P.S. I noticed that php_execute_script (https://github.com/php/php-src/blob/5f58f5ccf0909a90baef1280c3826f96b8e133ee/main/main.c#L2496) gets executed before zend_first_try (https://github.com/php/php-src/blob/5f58f5ccf0909a90baef1280c3826f96b8e133ee/sapi/cgi/cgi_main.c#L2356) where the -C option is processed. Not sure if this is by design.

Test script:
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Setup PHP for IIS. Add the following configuration 
</system.webServer>
        <fastCgi>
            <application fullPath="C:\php-7.2.7-nts-Win32-VC15\php-cgi.exe" arguments="-C" maxInstances="10" instanceMaxRequests="10000000" queueLength="10000">
                <environmentVariables>
                    <environmentVariable name="PHP_FCGI_MAX_REQUESTS" value="10000000" />
                    <environmentVariable name="PHPRC" value="C:\php-7.2.7-nts-Win32-VC15" />
                </environmentVariables>
            </application>
        </fastCgi>
</system.webServer>



<location path="" overrideMode="Allow">
        <system.webServer>
            <handlers accessPolicy="Read, Script">
                <add name="PHP-iisfcgi" path="*.php" verb="GET,HEAD,POST" modules="FastCgiModule" scriptProcessor="C:\php-7.2.7-nts-Win32-VC15\php-cgi.exe|-C" resourceType="Either" />
</system.webServer>
....
</location>

Expected result:
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If I execute php-cgi with -C, no chdir to script path should take place

Actual result:
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chdir to script path