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PHP Array Exercises : Displays array keys and values

PHP Array: Exercise-3 with Solution

$ceu = array( "Italy"=>"Rome", "Luxembourg"=>"Luxembourg", "Belgium"=> "Brussels", "Denmark"=>"Copenhagen", "Finland"=>"Helsinki", "France" => "Paris", "Slovakia"=>"Bratislava", "Slovenia"=>"Ljubljana", "Germany" => "Berlin", "Greece" => "Athens", "Ireland"=>"Dublin", "Netherlands"=>"Amsterdam", "Portugal"=>"Lisbon", "Spain"=>"Madrid", "Sweden"=>"Stockholm", "United Kingdom"=>"London", "Cyprus"=>"Nicosia", "Lithuania"=>"Vilnius", "Czech Republic"=>"Prague", "Estonia"=>"Tallin", "Hungary"=>"Budapest", "Latvia"=>"Riga", "Malta"=>"Valetta", "Austria" => "Vienna", "Poland"=>"Warsaw") ;

Create a PHP script which displays the capital and country name from the above array $ceu. Sort the list by the name of the capital.

Sample Solution:

PHP Code:

<?php
$ceu = array( "Italy"=>"Rome", "Luxembourg"=>"Luxembourg",
"Belgium"=> "Brussels", "Denmark"=>"Copenhagen",
"Finland"=>"Helsinki", "France" => "Paris",
"Slovakia"=>"Bratislava", "Slovenia"=>"Ljubljana",
"Germany" => "Berlin", "Greece" => "Athens",
"Ireland"=>"Dublin", "Netherlands"=>"Amsterdam",
"Portugal"=>"Lisbon", "Spain"=>"Madrid",
"Sweden"=>"Stockholm", "United Kingdom"=>"London",
"Cyprus"=>"Nicosia", "Lithuania"=>"Vilnius",
"Czech Republic"=>"Prague", "Estonia"=>"Tallin",
"Hungary"=>"Budapest", "Latvia"=>"Riga","Malta"=>"Valetta",
"Austria" => "Vienna", "Poland"=>"Warsaw") ;
asort($ceu) ;
foreach($ceu as $country => $capital)
{
echo "The capital of $country is $capital"."\n" ;
}
?>

Sample Output: 

The capital of Netherlands is Amsterdam                     
The capital of Greece is Athens                             
The capital of Germany is Berlin                            
The capital of Slovakia is Bratislava                       
The capital of Belgium is Brussels                          
The capital of Hungary is Budapest                          
The capital of Denmark is Copenhagen                        
The capital of Ireland is Dublin                            
The capital of Finland is Helsinki                          
The capital of Portugal is Lisbon                           
The capital of Slovenia is Ljubljana                        
The capital of United Kingdom is London                     
The capital of Luxembourg is Luxembourg                     
The capital of Spain is Madrid                              
The capital of Cyprus is Nicosia                            
The capital of France is Paris                              
The capital of Czech Republic is Prague                     
The capital of Latvia is Riga
The capital of Italy is Rome                                
The capital of Sweden is Stockholm                          
The capital of Estonia is Tallin                            
The capital of Malta is Valetta                             
The capital of Austria is Vienna                            
The capital of Lithuania is Vilnius                         
The capital of Poland is Warsaw

Flowchart:

Flowchart: Displays array keys and values

PHP Code Editor:

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Previous: $color = array('white', 'green', 'red'')
Write a PHP script which will display the colors in the following way
Next: Delete an element from the specified array. After deleting the element, integer keys must be normalized.

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Test your Programming skills with w3resource's quiz.



PHP: Tips of the Day

How to Sort Multi-dimensional Array by Value?

Try a usort, If you are still on PHP 5.2 or earlier, you'll have to define a sorting function first:

Example:

function sortByOrder($a, $b) {
    return $a['order'] - $b['order'];
}

usort($myArray, 'sortByOrder');

Starting in PHP 5.3, you can use an anonymous function:

usort($myArray, function($a, $b) {
    return $a['order'] - $b['order'];
});

And finally with PHP 7 you can use the spaceship operator:

usort($myArray, function($a, $b) {
    return $a['order'] <=> $b['order'];
});

To extend this to multi-dimensional sorting, reference the second/third sorting elements if the first is zero - best explained below. You can also use this for sorting on sub-elements.

usort($myArray, function($a, $b) {
    $retval = $a['order'] <=> $b['order'];
    if ($retval == 0) {
        $retval = $a['suborder'] <=> $b['suborder'];
        if ($retval == 0) {
            $retval = $a['details']['subsuborder'] <=> $b['details']['subsuborder'];
        }
    }
    return $retval;
});

If you need to retain key associations, use uasort() - see comparison of array sorting functions in the manual

Ref : https://bit.ly/3i77vCC