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run code in 500+ PHP versions simultaneously
<?php namespace Foo; class Bar { public static function testClass(): \Closure { return function(){}; } } function testFunc(): \Closure { return function(){}; } var_dump((new \ReflectionFunction(Bar::testClass()))->getNamespaceName()); var_dump((new \ReflectionFunction(testFunc()))->getNamespaceName());
Output for 8.4.1 - 8.4.23, 8.5.0 - 8.5.8
string(0) "" string(0) ""
Output for 8.1.0 - 8.1.34, 8.2.0 - 8.2.31, 8.3.0 - 8.3.31
string(3) "Foo" string(3) "Foo"

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