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<?php $arr = array('aaa'=>'aaa', 'bbb'=>'bbb'); $k = 'bbb'; if(array_key_exists($k,$arr)) $arr[$k] = 'ccc'; print_r($arr);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [aaa] => aaa [bbb] => ccc )