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run code in 200+ php & hhvm versions
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<?php $count = 138; $interval = floor($count / 5); print_r(range(1, $count, $interval));
based on 5nX9U
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.0
Array ( [0] => 1 [1] => 28 [2] => 55 [3] => 82 [4] => 109 [5] => 136 )