php - Passing 2 arrays to a javascript function with ajax -

this code submits form , id # addband.php. php inserts form data db, , echos array houses 2 arrays: 1 array of ids, other string update html select element. i've included php generates , echos arrays.

i keep getting "uncaught typeerror: cannot read property 'selectrestults' of undefined" following code. doing wrong?

javascript/jquery:

      $(function() {    $("#addbandform").submit(function(event) {   event.preventdefault();   var globalshowid = '&id=' + window.globalshowid;    $.ajax({      url: "womhscripts/addband.php",      type: "post",      data: $('#addbandform').serialize() + globalshowid,      success: function(msg) {       var actarray = msg['actidarray'];      var bandarray = msg['bandselectarray'];       var result = bandarray['selectresults'];       window.globalshowid='';       $("#band1").html(result)       },      error:function(errmsg) {        console.log(errmsg);     }    });  }); }); 

addband.php

$bandselectarray = array(); $actidarray = array(); $bandresults = "";  if (isset($_post['id'])) {     $showid = $_post['id'];      $actsql = mysqli_query($link, "select actid act showid=".$showid."");      while($actrow = mysqli_fetch_array($actsql))     {         $actidarray[] = array(             'actid' => $actrow['actid'],          );          } }   $selectbandsql = mysqli_query ($link, "select bandid, bandname band");   while ($row = mysqli_fetch_array($selectbandsql)) {      $bandid = $row['bandid'];     $bandname2 = $row['bandname'];      $bandresults .= '<option value="'.$bandid.'">'.$bandname2.'</option>';    }  $bandselectarray['selectresults'] = $bandresults;    $resultarray = array(); $resultarray['actidarray'] = $actidarray; $resultarray['bandselectarray'] = $bandselectarray;  echo json_encode($resultarray);