在php中调用数组

Question

I have my array in PHP like this:

$countryList = array (
    array( // Asia
        continent => 'Asia', 
        country   => array('Japan', 'China')
    ),
    array( // Europe
        continent => 'Europe', 
        country   => array('Spain', 'France', 'Italy')
    )
);

How can I call this array ($countryList) to ask what is the value of country if the continent is 'Asia' ?

I would like to have something like:

$country = 'Japan, China';

Thanks a lot.

Answer 1

$countryList = array (
    array( // Asia
        'continent' => 'Asia', 
        'country'   => array('Japan', 'China')
    ),
    array( // Europe
        'continent' => 'Europe', 
        'country'   => array('Spain', 'France', 'Italy')
    )
);

$continent = 'Asia';

foreach($countryList as $c)
  if ($c['continent'] == $continent)
  {
      echo join(', ', $c['country']);
      break;
  }

But it is better and easier to use associative arrays.

$countryList = array (
    'Asia'   => array('Japan', 'China'),
    'Europe' => array('Spain', 'France', 'Italy')
);

$continent = 'Asia';

echo isset($countryList[$continent]) ?
         join(', ', $countryList[$continent]) :
         'No such continent';

The last echo has an equivalent of the if .. then .. structure and checks whether the element with corresponding key exists in the array.