PDO Changes from 5.0.x To 5.1.x

[Chris Drozdowski <chris@xxxxxxxxxxxxxxxxx>]

According to documentation, PDO globals constants in 5.0.3+ were  
changed to class constants in 5.1.

Does anyone have a suggestion for portability of constants between  
the 5.0.x branch and the 5.1 branch without having to rewrite code.

Besides the constants, what other differences exist in PDO for 5.0.x  
and 5.1 that may effect portability/functionality?

Chris D.

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