Group associative array data by key prefix

Question

I have a array like this

Array (
    [operator_15] => 3
    [fiter_15] => 4
    [operator_17] => 5
    [fiter_17] => 5
    [operator_19] => 4
    [fiter_19] => 2
)

I want to separate this array in to 2 arrays:

1. key starting from fiter_
2. key starting from operator_

I used array filter and it doesn't work. any other option?

$array = array_filter(
    $fitered_values,
    function($key) {
        return strpos($key, 'fiter_') === 0;
    }
);

Answer 1

Give a try with below and see if its solve your problem

$array = array ( 
    'operator_15' => 3,
    'fiter_15' => 4,
    'operator_17' => 5,
    'fiter_17' => 5,
    'operator_19' => 4,
    'fiter_19' => 2 );

$operator=array();
$filter=array();

foreach($array as $key => $value){
    if (strpos($key, 'operator_') !== false) {
        $operator[$key] = $value;
    }

    if (strpos($key, 'fiter_') !== false) {
        $filter[$key] = $value;
    }   
}

print_r($operator);
print_r($filter);