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run code in 200+ php & hhvm versions
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<?php $kk = "1"; var_dump(explode('_', $kk));
Output for 5.6.0 - 5.6.30, hhvm-3.18.5 - 3.22.0, 7.1.0 - 7.3.0rc3
array(1) { [0]=> string(1) "1" }