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run code in 150+ php & hhvm versions
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<?php function a($a = 'waa') { var_dump($a); } a(); a(null);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
string(3) "waa" NULL