Find the Non-Repeating Elements in an Array

Question

My array is :

$array= array(4,3,4,3,1,2,1);

And I\'d like to output it like below:

Output = 2 

(As 2 i

Answer 1

You could use the array_count_values() php function.

For example :

$numbers = [4, 3, 4, 3, 1, 2, 1];

// build count array as key = number and value = count
$counter_numbers = array_count_values($numbers);

print_r($counter_numbers);

Output :

Array
(
    [4] => 2
    [3] => 2
    [1] => 2
    [2] => 1
)

Then loop through the new array to get non-repeated values :

$unique_numbers = [];

foreach ($counter_numbers as $number => $count) {
    if ($count === 1) {
        $unique_numbers[] = $number;
    }
}

print_r($unique_numbers);

Output :

Array
(
    [0] => 2
)

Hope it helps.