Function sort_by_weight
Sort an array according to the weight of its items.
The weight of the items is defined as an integer; a position relative to another member of the
array before:<key> or after:<key>; the special words top and bottom.
Parameters summary
array | 
		$array | 
		|
callable | 
		$weight_picker | 
		<p>The callback function used to pick the weight of the item. The function is called with the following arguments: <code>$value</code>, <code>$key</code>.</p> | 
Return value summary
			array
		 | 
		A sorted copy of the array. |