PhpStorm and xdebug in the browser - the missing instruction

I spent the usual two lifetimes getting xdebug working (again) after upgrading to a new major version of phpStorm. Finally, I could debug a standalone php script in the IDE, but all attempts to do so from the browser were fruitless.

It turns out that phpStorm and the browser were using different versions of php.

Things to do (note that I am using Macports):

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