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PHP array_key_exists不起作用; 数组不是多维的

我有一系列世界上所有国家:

$countries = array(
  "GB" => "United Kingdom",
  "US" => "United States",
  "AF" => "Afghanistan",
  "AL" => "Albania",
  "DZ" => "Algeria",
  "AS" => "American Samoa",
  "AD" => "Andorra",
  "AO" => "Angola",
  "AI" => "Anguilla",
  "AQ" => "Antarctica",
  "AG" => "Antigua And Barbuda",
  "AR" => "Argentina",
  "AM" => "Armenia",
  "AW" => "Aruba",
  "AU" => "Australia",
  "AT" => "Austria",
  "AZ" => "Azerbaijan",
  "BS" => "Bahamas",
  "BH" => "Bahrain",
  "BD" => "Bangladesh",
  "BB" => "Barbados",
  "BY" => "Belarus",
  "BE" => "Belgium",
  "BZ" => …
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html php forms arrays array-key-exists

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