How can the script be modified to display the desired output of countries and cities?

The issue can be solved by modifying the array structure to associate each country with its corresponding cities. This can be achieved by creating a multidimensional array where each country is a key that holds an array of cities as its value. 

<?php
// Define the array with countries and cities
$countries = [
    'USA' => ['New York', 'Los Angeles', 'Chicago'],
    'UK' => ['London', 'Manchester', 'Birmingham'],
    'France' => ['Paris', 'Marseille', 'Lyon']
];

// Loop through the countries and cities to display the desired output
foreach ($countries as $country => $cities) {
    echo $country . ": " . implode(", ", $cities) . "<br>";
}
?>

Keywords

PHP array foreach multidimensional nested array

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