Defining multiple namespace in a single file:
In a single PHP file we can declare more than one namespace. PHP allow two syntaxes to declare more than one namespace in a single file. But it is not recommended to declare more than one namespace in a single file.
It is strongly discouraged to combine multiple namespaces into the same file.
No coding should write outside the namespace brackets except the declare statement.
Following code will not produce any output and no error report will be generated but this kind of coding is not advisable.
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