更改数组中键的值并重新排列整个多维数组

Question

i have an array below

Array
(
    [0] => Array
        (
            [id] => 1
            [title] => task 1
            [tech_user_id] => 1
            [dev_priority] => 1
        )

    [1] => Array
        (
            [id] => 2
            [title] => task 2
            [tech_user_id] => 1
            [dev_priority] => 2
        )

    [2] => Array
        (
            [id] => 3
            [title] => task 3
            [tech_user_id] => 1
            [dev_priority] => 3
        )

    [3] => Array
        (
            [id] => 4
            [title] => task 4
            [tech_user_id] => 1
            [dev_priority] => 4
        )

)

I want to change the priority of a task and rearrange the whole array.

Eg: if i want to change the dev_priority of task title = "task 3" from 3 to 1, then dev_priority of "task 1" should be 2 and dev_priority for "task 2" should be 3.

want to write a function rearrange where we pass $id and $set_priority and $set_priority should assigned against the given $id and whole array rearrange based on dev_priority.

rearrange($id, $set_priority) {
    // ...
}

Expected Output :

Array
(
    [0] => Array
        (
            [id] => 3
            [title] => task 3
            [tech_user_id] => 1
            [dev_priority] => 1
        )
    [1] => Array
        (
            [id] => 1
            [title] => task 1
            [tech_user_id] => 1
            [dev_priority] => 2
        )

    [2] => Array
        (
            [id] => 2
            [title] => task 2
            [tech_user_id] => 1
            [dev_priority] => 3
        )


    [3] => Array
        (
            [id] => 4
            [title] => task 4
            [tech_user_id] => 1
            [dev_priority] => 4
        )

)

Answer 1

<?php 

function reArrange(&$result,$id,$new_dev_priority){
    $curr_index  = array_search($id,array_column($result,"id"),true);
    $limit_index = array_search($new_dev_priority,array_column($result,"dev_priority"),true);

    $process_node = $result[$curr_index];
    $curr_dev_priority = $process_node['dev_priority'];
    if($curr_dev_priority === $new_dev_priority) return; // return if same priority was assigned.    
    $offset = $curr_dev_priority > $new_dev_priority ? -1 : 1;

    /* rearrange by relocating elements to a new location(this is a minimized shift) */
    while($curr_index != $limit_index){
        $result[$curr_index] = $result[$curr_index + $offset];
        $result[$curr_index]['dev_priority'] = $result[$curr_index]['dev_priority'] - $offset;        
        $curr_index += $offset;
    }  

    $process_node['dev_priority'] = $new_dev_priority; // assign new dev priority
    $result[$curr_index] = $process_node;
}

Demo: https://3v4l.org/nggja

• We get the current index of the process and the index of the process which has our desired new dev priority.
• We do this because we only want to shift elements from our current location till our desired location. Shifting irrelevant processes out of this range is trivial.
• We define a variable called offset which just determines the direction of shift. -1 for up and 1 for down.
• Time complexity: O(n) (in worst case), Space Complexity: O(1).