Question

I have an array with this structure:

array(4) { 
     [0]=> array(x) { 
        [0]=> string(x)"London" 
        [1]=> string(xx) "John"}
     [1]=> array(x) { 
        [0]=> string(x)"London" 
        [1]=> string(xx) "Charles"}
     [2]=> array(x) { 
        [0]=> string(x)"Paris" 
        [1]=> string(xx) "Alan"}
     [3]=> array(x) { 
        [0]=> string(x)"Paris" 
        [1]=> string(x) "Wayne"} 
    }

How can I display the array data in this order:

London

John | Charles

Paris

Alan | Wayne

This can be done with an unique multidimensional array? or should i have another array to select distinct cities?

I am talking about something like a loop with:

foreach ($cities as $city) {
    echo '<div class="city">'.$city.'</div>';
        for() {
            echo '<div class="persons">'.$persons.'</div>';
        }
}

thanks

Answer 1

Group your cities in a new array, then spit it out

$newCities = array();

foreach ($cities as $city) {
    $newCities[$city[0]][] = $city[1];
}

foreach($newCities as $city => $persons) {
   echo '<div class="city">' . $city . '</div>';

   // use join to glue the pieces together
   echo '<div class="persons">' . join(' | ', $persons) . '</div>';

}