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<?php $arr = array( "ONE"=>1, "TWO"=>2, "THREE"=>3, "FOUR"=>4, "FIVE"=>5, "SIX"=>6, "SEVEN"=>7, "EIGHT"=>8, "NINE"=>9, "ZERO"=>0, "UNKNOWN" => 'unknown', ); var_dump(array_search('unknown', $arr));

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