How do i swap values? - php

Question

I have list of departments, against each department there is a button which is UP and another button DOWN
When you click on UP Button, It calls the function up..
Public function actionUP($id, $sort_order){
$allDeps = Department::model()->findAll($criteria);
$depArr = array();
foreach ($allDeps as $department){
$temp = array();
$temp['id'] = $department->id;
$temp['sort_order'] = $department->sort_order;
$depArr[] = $temp;
}
Now if i var dump this array depArr i am getting an array..
array (size=17)
0 =>
array (size=2)
'id' => string '142' (length=3)
'sort_order' => string '1' (length=1)
1 =>
array (size=2)
'id' => string '141' (length=3)
'sort_order' => string '2' (length=1)
2 =>
array (size=2)
'id' => string '144' (length=3)
'sort_order' => string '5' (length=1)
3 =>
array (size=2)
'id' => string '140' (length=3)
'sort_order' => string '6' (length=1)
4 =>
array (size=2)
'id' => string '139' (length=3)
'sort_order' => string '3' (length=1)
5 =>
array (size=2)
'id' => string '143' (length=3)
'sort_order' => string '4' (length=1)
I have list of departments, position is actually sort_order and there are up and down button against department, up buttons calls for actionUP which sends the up?id=143&sort_order=4
If a user clicks on up button against position 4 its position should changed to 3, and the department at 3 should go to 4 and ALSO UPDATE INTO DATABASE..
I am using Yii 1.1 PHP framework

Answer 1

Flow:
Search using
array_search('whateverID', array_column($depArr, 'id'));
Now you have the index and the sort order, you just need to search for sort order - 1 now.
array_search($depArr[x]['sort_order']-1, array_column($depArr,
'sort_order'));
You now have both element's index, swap the sort order or unset and set again. Hope this helps.