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run code in 200+ php & hhvm versions
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<?php $arr = 'test::test.group.something'; var_dump(list($namespace, $rest) = explode('::', $arr));
Output for 4.3.0 - 5.6.38, hhvm-3.10.1 - 3.22.0, 7.0.0 - 7.3.1
array(2) { [0]=> string(4) "test" [1]=> string(20) "test.group.something" }