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<?php $array1 = array('hi' => "Hello", 'bye'=> "Bye bye", 'w'=>"what", ); $array2 = array('hi' => "Hello", 'bye'=> "Bye bye", 'we'=>"where", 'w'=>"what", ); $array3 = array_merge($array1, $array2); ksort($array3); print_r($array3);
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Array ( [bye] => Bye bye [hi] => Hello [w] => what [we] => where )