Description:
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Internal "main" registered constants, (constants with module_number = 0, Core) have weird behaviour when they are fetched from get_defined_constants(), this could suggest that its either get_defined_constants() or something generally wrong with these constants and Unicode. See the actual result output for the unicode garbage thats returned.

Reproduce code:
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print_r(get_defined_constants());

Expected result:
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See Actual result, output without unicode garbage

Actual result:
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http://pastie.org/499080