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run code in 200+ php & hhvm versions
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<?php $bla = array_combine( range(1, 3), range(1, 3) ); var_dump(range(1, 3));
based on 49gAT
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.0
array(3) { [0]=> int(1) [1]=> int(2) [2]=> int(3) }