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I'm currently working with PDO in detail, checking several bugs/limitations of different drivers.

I found this in the docs:
"The value of the PDO::ATTR_PERSISTENT option is converted to bool (enable/disable persistent connections), unless it is a non-numeric string, in which case it allows to use multiple persistent connection pools."

The value is documented as integer elsewhere in the docs, so how can it be a "non-numeric string"?

Can someone explain this to me? Can't find an example.