Function sortByKey
Sorts given $array by key $sortBy.
		
		Package: Cake
Link: http://book.cakephp.org/2.0/en/core-libraries/global-constants-and-functions.html#sortByKey
Copyright: Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
License: MIT License
Located at Cake/basics.php
	
	Link: http://book.cakephp.org/2.0/en/core-libraries/global-constants-and-functions.html#sortByKey
Copyright: Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
License: MIT License
Located at Cake/basics.php
sortByKey( array $array , string $sortBy , string $order = 'asc' , integer $type = SORT_NUMERIC )
Parameters summary
array | 
			& $array | 
			$array Array to sort | 
string | 
			$sortBy | 
			Sort by this key | 
string | 
			$order = 'asc' | 
			Sort order asc/desc (ascending or descending). | 
integer | 
			$type = SORT_NUMERIC | 
			Type of sorting to perform | 
Returns
- 
				
array|nullSorted array, or null if not an array.