PHP/Data Structure/arsort

arsort() function maintains the original index association and sorts the elements in reverse order.

 
Its syntax is: void arsort (array array)
<?
    $cities = array ("A" => "a",
            "I" => "i",
            "A" => "z",
            "F" => "f",
            "C" => "c");
    arsort($cities);
    for (reset ($cities); $key = key ($cities); next ($cities)) :
         print "cities[$key] = $cities[$key] <br>";
    endfor;
?>

arsort( ) function reverse sorts it by its values while preserving the keys

 
//bool arsort ( array &arr [, int options] )
<?
    $capitalcities["England"] = "London";
    $capitalcities["Wales"] = "Cardiff";
    $capitalcities["Scotland"] = "Edinburgh";
    arsort($capitalcities);
?>

Reversing an Array Using arsort()

 
<?php 
    $dogs = array("A" => "C", "B" => "D", "X" => "Z", "Q" => "T"); 
    arsort($dogs); 
    printf("<pre>%s</pre>\n", var_export($dogs, TRUE)); 
?>

Sorting with arsort()

 
<?
$meal = array("breakfast" => "A",
              "lunch" => "B",
              "snack" => "C",
              "dinner" => "D");
print "Before Sorting:\n";
foreach ($meal as $key => $value) {
    print "   \$meal: $key $value\n";
}
arsort($meal);
print "After Sorting:\n";
foreach ($meal as $key => $value) {
    print "   \$meal: $key $value\n";
}
?>