Restore array items after every iteration in PHP - php

Question

I am trying to restore all array items after each for loop iteration. This I need to set Laravel validation Rule::notIn($arry)
I have an array of station_id generated by cloned input fields. I want to check if all cloned station ids are unique, and so be sure that no repeated station in the metro route.
For cloned fields, I am setting up a rule using for a loop by counting cloned items.
So the issue is, I want to use `Rule::notIn($stationIds) except the current iteration item id so I can validate by checking the current id is not in the rest of the array items.
public function rules()
{
// getting all input fields value
$rStationIds = $this->get('station_id')
...
// get the max number of input
$counter = $this->getMaxCount($rStationIds, ...);
$rules = [];
// loop through each item
for ($r = 0; $r < $counter; $r++) {
unset($rStationIds[$r]);
$rules['station_id'][$r] = ['required', 'int', Rule::notIn($rStationIds)];
}
...
}
The problem in the above code is that when I unset($var) the current item, it never reset back with the original array elements; thus, the last field will have nothing to compare because the array will get empty.
I am okay with any other approach as well to check the unique item for the cloned station id fields.

Answer 1

Change your loop to:
// loop through each item
for ($r = 0; $r < $counter; $r++) {
$temp = $rStationIds[$r];
unset($rStationIds[$r]);
$rules['station_id'][$r] = ['required', 'int', Rule::notIn($rStationIds)];
$rStationIds[$r] = $temp;
}