PHP从数组问题中删除元素

Question

I am doing with Laravel 5. And the problem I am facing is that I have an array in session and now I want to remove a single element from that array and for the sake I am using array_diff function.

When I get array from session it's in the form like:

["4","5","6"]

But when I try to remove element '5' from array it deforms the array and the result then is:

{"0":"4","2":"6"}

My code is:

array_diff($arr, array(5))

The result is same with unset([$index]) also.

The real code:

Session::push('compare.products', $id); 
$compare = Session::get('compare'); 
if(($key = array_search($id, $compare['products'])) !== false) {   
    unset($compare['products'][$key]);
    return $compare['products']; 
}

Answer 1

If you want to keep correct indexes you have to call array_values after the unset.

In your case, it will be :

Session::push('compare.products', $id); 
$compare = Session::get('compare'); 
if(($key = array_search($id, $compare['products'])) !== false) {   
    unset($compare['products'][$key]);
    return array_values($compare['products']); 
}

In a general case, it's :

$array = array(0, 1, 2, 3);

unset($array[2]);

$array = array_values($array);
var_dump($array);
/* array(3) {
  [0]=>
     int(0)
  [1]=>
     int(1)
  [2]=>
     int(3)
} */ 

https://stackoverflow.com/a/369761/4682796