有人能提供一般功能，根据给定的偏移量从数组中移动项目吗？

Question

I would like to shift the items in array based on given offset. In my current project I need to do this often so I am looking for a common function.

$data = [1, 2, 3, 4, 5, 6];

$data = shift($data, 2);

dd($data); //should result into [3, 4, 5, 6, 1, 2]

function shift($data, $offset) {
// general code
}

Thanks in advance.

Answer 1

You can use laravel collection macro to create your own custom functions.

Below is the macro which will support the negative offset as well.

$collection = collect([1, 2, 3, 4, 5, 6]);

$rotate = $collection->rotate(2);

$rotate->toArray();

// [3, 4, 5, 6, 1, 2]

Collection::macro('rotate', function ($offset) {
    if ($this->isEmpty()) {
        return new static;
    }
    $count = $this->count();
    $offset %= $count;
    if ($offset < 0) {
        $offset += $count;
    }
    return new static($this->slice($offset)->merge($this->take($offset)));
});

You can use collection in native PHP as well but below function can be used in native PHP.

function array_rotate($array, $shift) {
    $shift %= count($array); 
    if($shift < 0) $shift += count($array);
    return array_merge(array_slice($array, $shift, NULL, true), array_slice($array, 0, $shift, true));
}

Both functions will preserve keys if explicitly specified.