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run code in 200+ php & hhvm versions
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<?php $a = array('a' => 1, 'b' => 2, 'c' => 3); unset($a['c']); var_dump($a);
based on upKO5
Output for 4.3.0 - 7.2.0
array(2) { ["a"]=> int(1) ["b"]=> int(2) }