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run code in 150+ php & hhvm versions
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<?php function foo($bar = 'asdf') { var_dump($bar); } foo(); foo(NULL); foo('qwer');
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(4) "asdf" NULL string(4) "qwer"