Can not send Multiple choices from select2 with fromdata to upload file - php

Question

I have html select2,it can selected multiple option:
<div class="form-group">
<label class="col-sm-1 control-label no-padding-right" for="form-field-recipient">Recipient:</label>
<div class="col-sm-6 col-xs-12">
<span class="input-icon block col-xs-12 no-padding">
<select name="for" id="for" class="for" multiple="multiple" placeholder="For" style="width: 92%">
<?php
foreach($this->forList as $dataFor){
?>
<option value="<?php echo $dataFor['ohp_id'];?>"><?php echo $dataFor['title'];?> Of <?php echo $dataFor['name'];?></option>
<?php } ?>
<?php
foreach($this->group as $group){
?>
<option value="<?php echo $group['object_group_id'];?>"><?php echo $group['object_group_name'];?></option>
<?php } ?>
</select>
<i class="ace-icon fa fa-user col-xs-0"></i>
</span>
</div>
</div>
$(document).ready(function() {
$(".refnd").select2({placeholder: "Reference ND"});
$(".for").select2({placeholder: "For"});
And this jquery:
But in PHP,it just show 1 option selected. How To fix it?

Answer 1

Change the dropdown name as an array:
<select name="for" id="for" class="for" multiple="multiple" placeholder="For" style="width: 92%">
<select name="for[]" id="for" class="for" multiple="multiple" placeholder="For" style="width: 92%">
JS:
var selectedOpt = $('#for').val(); // it will return an array of selected options
// Now use the selectedOpt array in your ajax call