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<?php namespace Foo\Bar\Baz; $closureBeforeDefined = function () { return \Foo\Bar\Baz\A_RELATIVE_CONSTANT; }; define('A_RELATIVE_CONSTANT', 'IN GLOBAL NAMESPACE'); var_dump($closureBeforeDefined()); define('Foo\\Bar\\Baz\\A_RELATIVE_CONSTANT', 'IN RELATIVE NAMESPACE'); $closureAfterDefined = function () { return \Foo\Bar\Baz\A_RELATIVE_CONSTANT; }; var_dump($closureBeforeDefined()); var_dump($closureAfterDefined()); $constants = get_defined_constants(true); var_dump($constants['user']);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Error: Undefined constant "Foo\Bar\Baz\A_RELATIVE_CONSTANT" in /in/NMkgd:6 Stack trace: #0 /in/NMkgd(11): Foo\Bar\Baz\{closure}() #1 {main} thrown in /in/NMkgd on line 6
Process exited with code 255.

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