php: sort assoc array by key ascending or descending

Trabla: php: sort assoc array by key ascending or descending

Solving:

Use  ksort to sort ascending ( from low to high ) by key

Use  krsort to sort descending ( from high to low ) by key

Examples:

<?php

$arr = array(
    '2015-01-10' => array( "name"=>"Test2", "status"=>"failed" ),
    '2013-01-10' => array( "name"=>"Test1", "status"=>"passed" ),
    '2016-01-10' => array( "name"=>"Test3", "status"=>"passed" ),
);

ksort( $arr );
print_r($arr);

/*
Result - ascending from low to high:
Array ( 
  [2013-01-10] => Array ( [name] => Test1 [status] => passed ) 
  [2015-01-10] => Array ( [name] => Test2 [status] => failed ) 
  [2016-01-10] => Array ( [name] => Test3 [status] => passed ) 
)
*/

krsort( $arr );
print_r( $arr);

/*
Result - descending from high to low:
Array ( 
 [2016-01-10] => Array ( [name] => Test3 [status] => passed ) 
 [2015-01-10] => Array ( [name] => Test2 [status] => failed ) 
 [2013-01-10] => Array ( [name] => Test1 [status] => passed ) 
)
*/

Official Docs:
http://php.net/manual/en/array.sorting.php