PHP uses the method of collecting to insert a value into the specified position in the array

Demand analysis

Recently, in the process of project development, the sorting in the list requires reordering by dragging up and down , for example ：A,B,C,D,E. Now we have to put F Insert into C Back , And then according to A,B,C,F,D,E Sort .

Solution

After trying various methods , Discover through set collect Some methods in can realize this function quickly .
Thinkphp Frame neutralization PHP Native projects can be directly through composer install .Laravel8 Set in Illuminate\Support\Collection Method can be used directly .

// Installation collection collect Method 
composer require tightenco/collect

The latest version of the installation package is installed by default .

Code demonstration

    /** *  Implement the first of the specified elements in the array 、 Insert the specified value after . * @param [type] $sort  Inserted array data  * @param [type] $move_sort  Elements to insert  * @param [type] $choose_sort  The inserted element  * @param [type] $type 1 Insert in front ,2 Insert after  * @return void */
    function sort_edit($sort, $move_sort, $choose_sort, $type)
    {
    
        $sortCollection = collect($sort);
        $index = $sortCollection->search($choose_sort);
        [$left, $right] = $sortCollection->filter(function ($item) use ($move_sort) {
    
            return $item != $move_sort;
        })
            ->partition(function ($item, $key) use ($index, $type) {
    
                if ($type == 1) {
    
                    return $key < $index;
                } else {
    
                    return $key <= $index;
                }
            });
        $left->push($move_sort);
        return $left->values()->merge($right->values());
    }

Usage method

$sort = [1, 2, 3, 4, 5, 6, 7, 8];
$move_sort = 9;
$choose_sort = 3;
$type = 2;
sort_edit($sort, $move_sort, $choose_sort, $type)

Result demonstration

9 It's in line 3 Behind

{
    
  "status": 200,
  "message": " Successful operation ",
  "data": [
    1,
    2,
    3,
    9,
    4,
    5,
    6,
    7,
    8
  ]
}

Methods to analyze

search Method searches the collection for a given value and returns its key . If not found , Then return to false .
filter Method uses the given callback function to filter the collection , Only those set items that pass the specified condition test .
partition Is that you can and PHP Of list Method in combination with , Whether the callback return is true is used to separate the elements that pass the specified condition and those that do not pass the specified condition .
Attach collection document .https://learnku.com/docs/laravel/8.x/collections/9390