Geography: countries and their capitals

• Given is an associative array $capitals with countries (keys) and their capitals (values)
• Generate a random country
• Add a select list with all possible answers (capitals sorted alphabetically)
• Submit your answer (to the same page) when clicking the button, and show some feedback:
  • When no capital is selected: Please choose a city! in a div with class box-warning
  • When a wrong capital is selected: "Wrong: the correct answer is ... in a div with class box-warning
  • When the correct capital is selected: Correct! in a div with class box-info

Tips

• The random country can be generated with the function array_rand(), which generates a random key of an array, on the given array $capitals
• Use a hidden field (type="hidden") to pass the value of this random country along with your GET or POST request