// in_array, array_search  could not find a solution for multidimentional arrays
// $data[] = array('pcn' => 20, 'amt' => 8);
// array_push($cds, array('pcn'=>15,'amt'=> 20));  looks both same to insert an element

array(2) {
  [0]=>
  array(2) {
    ["pcn"]=>
    int(15)
    ["amt"]=>
    int(200)
  }
  [1]=>
  array(2) {
    ["pcn"]=>
    int(20)
    ["amt"]=>
    int(8)
  }
}
<br><br> ddddd<br>array(2) {
  [0]=>
  array(2) {
    ["pcn"]=>
    int(15)
    ["amt"]=>
    int(20)
  }
  [1]=>
  array(2) {
    ["pcn"]=>
    int(20)
    ["amt"]=>
    int(200)
  }
}
<br><br>Array
(
    [0] => Array
        (
            [pcn] => 15
            [amt] => 20
        )

    [1] => Array
        (
            [pcn] => 20
            [amt] => 200
        )

    [2] => Array
        (
            [pcn] => 30
            [amt] => 400
        )

)