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<?php namespace Foo\Bar\Baz { $closureBeforeDefined = function () { return relativeFunction(); }; var_dump($closureBeforeDefined());} namespace { function relativeFunction() { return 'IN GLOBAL NAMESPACE'; } } namespace Foo\Bar\Baz { function relativeFunction() { return 'IN RELATIVE NAMESPACE'; } $closureAfterDefined = function () { return relativeFunction(); }; var_dump($closureBeforeDefined()); var_dump($closureAfterDefined()); }

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