Functions for sorting arrays

How to sort strings in ascending order

      
      $names = array('Mike', 'Anne', 'Joel', 'Ray', 'Pren');

      sort($names);

How to sort numbers in ascending order

      
      $numbers = array(520, '33', 9, '199');

      sort($numbers, SORT_NUMERIC);

How to sort in descending order

      
      $names = array('Mike', 'Anne', 'Joel', 'Ray', 'Pren');

      rsort($names);

How to sort an associative array

      
      $tax_rates = array('NC' => 7.75, 'NY' => 8.875, 'CA' => 8.25);

      asort($tax_rates); // sorts by value (ascending)

      ksort($tax_rates); // sorts by key (ascending)

      arsort($tax_rates); // sorts by value (descending)

      krsort($tax_rates); // sorts by key (descending)

The sorting functions don’t return an array. Instead, they modify the array that’s passed to them.
The $compare parameter works the same for all sorting functions.A stack is a special type of array that implements a last-in, first-out (LIFO) collec-tion of values. You can use the array_push() and array_pop() functions to add and remove elements in a stack.

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