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run code in 150+ php & hhvm versions
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<?php var_dump(array(100000000000000000000=>0));
Output for 5.5.0 - 7.1.0
array(1) { [7766279631452241920]=> int(0) }
Output for 5.3.0 - 5.4.45
array(1) { [0]=> int(0) }
Output for 4.3.0 - 5.2.17
array(1) { [-9223372036854775808]=> int(0) }