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Instead of requiring the type to be determined in advance by the describer function and then requiring get_col to return a buffer of appropriate type, allow get_col to return an arbitrary zval. See UPGRADING.INTERNALS for a more detailed description of the change. This makes the result fetching simpler, more efficient and more flexible. The general possibility already existed via the special PDO_PARAM_ZVAL type, but the usage was very inconvenient and/or inefficient. Now it's possible to easily implement behavior like "return int if it fits, otherwise string" and to avoid any kind of complex management of temporary buffers. This also fixes bug #40913 (our second highest voted bug of all time, for some reason). PARAM_LOB result bindings will now consistently return a stream resource, independently of the used database driver. I've tried my best to update all PDO drivers for this change, but some of the changes may be broken, as I cannot test or even build some of these drivers (in particular PDO dblib and PDO oci). Fixes are appreciated -- a working CI setup would be even more appreciated ;)