array_flip

• This function’s solution uses a Ruby Hash object since Ruby arrays don’t use associative key/value pairs. See Array for more details.

  We can swap key/values in a Ruby hash using Hash#invert.

  PHP

  $array = array('bike' => 1, 'car' => 2, 'truck' => 3);
  $result = array_flip($array);
  var_export($result);
  // => array(1 => 'bike', 2 => 'car', 3 => 'truck')

  Ruby

  hash = {'bike' => 1, 'car' => 2, 'truck' => 3}
  p hash.invert
  # => {1 => "bike", 2 => "car", 3 => "truck"}

  Just like in PHP, conflicting keys will be overwritten.

  PHP

  $array = array('bike' => 1, 'car' => 1, 'truck' => 2);
  $result = array_flip($array);
  var_export($result);
  // => array(1 => 'car', 2 => 'truck')

  Ruby

  hash = {'bike' => 1, 'car' => 1, 'truck' => 2}
  p hash.invert
  # => {1 => "car", 2 => "truck"}

  see also

  • array_values
  • array_keys
  • array_reverse

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