Php array duplicates separation [duplicate]

You can use array_count_values to find out how many times each element occurs in the array. You won't have {1, 1, 1} but you'll have [1] => 3 which I hope amounts to the same thing for your use.

This could easily be done by a simple loop:

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

foreach($ids as $id){
    $new[$id][] = $id;
}

print_r($new);

Output:

Array
(
    [1] => Array
        (
            [0] => 1
            [1] => 1
            [2] => 1
        )

    [2] => Array
        (
            [0] => 2
            [1] => 2
        )

    [3] => Array
        (
            [0] => 3
            [1] => 3
        )

)

You can do this

$ids = array(1, 1, 1, 2, 2, 3, 3);
foreach($ids as $key) {
    //Calculate the index to avoid duplication
    if(isset(${"arr_$key"})) $c = count(${"arr_$key"}) + 1;
    else $c = 0;
    ${"arr_$key"}[$c] = $key;
}

Demo

I understand that you want distinct array values (no repetition). If so, then here goes:

$ids = array(1, 1, 1, 2, 2, 3, 3);
$distinct_ids = array_values(array_unique($ids));

to give the output as

array (size=3)
0 => int 1
1 => int 2
2 => int 3

array_unique removes duplicate values from the array, while array_value resets the array keys.

Documentation: array_values, array_unique