<?php
class MyArray {
  public function getAr() {
    $d = 42;
    $data = array($d);
    return $data;
  }
  public function get3() {
    $d = 43;
    $data = array($d);
    return $data;
  }
}
$get = new MyArray();
$arrayAr = $get->getAr();
$array3 = $get->get3();
var_export(array_merge($arrayAr ,$array3)); // [0 => 42, 1 => 43]