Sorting Associative Arrays Alphabetically

 ksort($a); asort($a); 

Sorting associative arrays can be done in one of several ways:

• Sort by keys, leave key-value association intact: Use ksort().

• Sort by keys in reverse order, leave key-value association intact: Use krsort().

• Sort by values, leave key-value association intact: Use asort().

• Sort by values in reverse order, leave key-value association intact: Use arsort().

Sorting an Associative Array (sort_a.php)

 <pre> <?php   $a = array('one' => 'I', 'two' => 'II', 'three' =>     'III', 'four' => 'IV');   ksort($a);   print_r($a);   asort($a);   print_r($a); ?> </pre> 

The preceding code shows these functions in action; Figure 2.3 shows the result.

Figure 2.3. Sorting associative arrays.

NOTE

Trying to use sort() or rsort() with associative arrays worksbut the keys are then all lost.