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51
Some PHP code might not have a namespace and therefore lives in the . . . . . . namespace.
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Answer: Option B
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52
All classes in the same namespace or subnamespace don’t have to the declared in the same PHP file.
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Answer: Option A
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53
It is possible to create a hierarchy of namespaces in PHP.
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Answer: Option B
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54
The value of __NAMESPACE__ is a string that contains the current namespace name. In global, un-namespaced code, it contains . . . . . .
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Answer: Option C
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