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run code in 150+ php & hhvm versions
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<?php $productStates = array(1,2,3,4,5); if(($key = array_search('3', $productStates)) !== false) { unset($productStates[$key]); } print_r($productStates);
based on td6PY
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Array ( [0] => 1 [1] => 2 [3] => 4 [4] => 5 )
Output for hhvm-3.10.0

Process exited with code 153.