PHP array eliminar duplicados: https://es.stackoverflow.com/q/105643/2...

    Array
(
    [0] => Array
        (
            [epec] => 1792
        )

    [1] => Array
        (
            [epec] => 1212
        )

)
VIENDO EL var_dump()array(2) {
  [0]=>
  array(1) {
    ["epec"]=>
    int(1792)
  }
  [1]=>
  array(1) {
    ["epec"]=>
    int(1212)
  }
}