I have associative array like below
$arr = [1=>0, 2=>1, 3=>1, 4=>2]
I would like to remove the duplicate values from the initial array and return those duplicates as a new array. So I would end up with something like;
$arr = [1=>0, 4=>2]
$new_arr = [2=>1, 3=>1]
Does PHP provide such a function or if not how would I achieve this?
You can get unique values from an array using array_unique and then compare the resulting array with array_diff_assoc
This will keep the indexes for both arrays, here's an example:
$arr = array(1=> 2, 2=>2, 3=>3);
print_r($arr);
$arr1 = array_unique($arr);
print_r($arr1);
$arr2 = array_diff_assoc($arr,$arr1);
print_r($arr2);
And the result:
Array
(
[1] => 2
[2] => 2
[3] => 3
)
Array
(
[1] => 2
[3] => 3
)
Array
(
[2] => 2
)
Try:
Use array_filter() to get all duplicate values from array
Use array_diff() to get all unique values from array
$array = array(1=>0, 2=>1, 3=>1, 4=>2);
$counts = array_count_values($array);
$duplicates = array_filter($array, function ($value) use ($counts) {
return $counts[$value] > 1;
});
print '<pre>';print_r($duplicates);
$result=array_diff($array,$duplicates);
print '<pre>';print_r($result);
Output:
Array
(
[2] => 1
[3] => 1
)
Array
(
[1] => 0
[4] => 2
)
