Add get_resource_id() function

Behavior is same as for (int) $resource, just under a clearer
name. Also type-safe, in that the parameter actually needs to
be a resource.

Clo

Add get_resource_id() function

Behavior is same as for (int) $resource, just under a clearer
name. Also type-safe, in that the parameter actually needs to
be a resource.

Closes GH-5427.

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