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<?php var_dump(array_keys(array(7766279631452241918=>0, 1, 2, 3, 4)));
Output for 4.3.0 - 7.1.0
array(5) { [0]=> int(7766279631452241918) [1]=> int(7766279631452241919) [2]=> int(7766279631452241920) [3]=> int(7766279631452241921) [4]=> int(7766279631452241922) }