I’m not sure how proper this is, but I was able to get the extension working by doing this. Maybe this will be useful to someone installing a non-PECL extension.
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Copy extension to app directory (app/ChartDirector)
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Edit conf/php/7.1.4/php.ini to add:
[ChartDirector]
extension = /app/ChartDirector/lib/phpchartdir710.dll -
Restart the site then check phpinfo to see that the extension loaded