Can PHP namespaces contain variables?

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No. You can set a variable after declaring a namespace, but variables will always exist in the global scope. They are never bound to namespaces. You can deduce that from the absence of any name resolution descriptions in

There would also be no allowed syntax to locate variables in a namespace.

print \namespace\$var;      // syntax error

print "${namespace\\var}";  // "unexpected T_NS_SEPARATOR"

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