Postgresql hhvm 502 bad getaway error pgsql.so: undefined symbol: _ZNK4HPHP9ArrayData6existsEl

I was getting the same thing with 3.8.0. Try adding the
following to the top of pdo_pgsql.cpp and recompiling.

#include “hphp/runtime/base/array-data.h”
#include “hphp/runtime/base/array-init.h”

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