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run code in 200+ php & hhvm versions
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<?php function test (array $arr = null) { var_dump($arr); } test(); test([0,1,2]); test(null);
Output for 5.6.0 - 5.6.30, hhvm-3.18.4 - 3.21.0, 7.0.0 - 7.3.0beta1
NULL array(3) { [0]=> int(0) [1]=> int(1) [2]=> int(2) } NULL