{{code:php
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.
{{code:php $array = array('bike' => 1, 'car' => 2, 'truck' => 3); $result = array_flip($array); var_export($result); // => array(1 => 'bike', 2 => 'car', 3 => 'truck') }}
{{code: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.
{{code:php $array = array('bike' => 1, 'car' => 1, 'truck' => 2); $result = array_flip($array); var_export($result); // => array(1 => 'car', 2 => 'truck') }}
{{code:ruby hash = {'bike' => 1, 'car' => 1, 'truck' => 2} p hash.invert # => {1 => "car", 2 => "truck"} }}
{{related: array/array_values array/array_keys array/array_reverse }}