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How to Debug the Service Container & List Services
You can find out what services are registered with the container using the console. To show all services and the class for each service, run:
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$ php bin/console debug:containerBy default, only public services are shown, but you can also view private services:
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$ php bin/console debug:container --show-privateNote
If a private service is only used as an argument to just one other service,
it won't be displayed by the debug:container command, even when using
the --show-private option. See Inline Private Services
for more details.
You can get more detailed information about a particular service by specifying its id:
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$ php bin/console debug:container app.mailer