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run code in 150+ php & hhvm versions
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<?php $foo = array(); $foo[3] = 1; $foo[7] = 3; var_dump($foo);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(2) { [3]=> int(1) [7]=> int(3) }