Magento2 : How to retrieve Values from keys in System multiselect field

Question

I have implemented a system configuration multiselect field (system.xml).

 <field id="foolist" translate="label" type="multiselect" sortOrder="10" showInDefault="1" showInWebsite="1" showInStore="1">
 <label>Allow Foo</label>
 <source_model>Vendor\Module\Model\Config\Source\Foolist</source_model>
 </field>

with :

<?php
namespace Vendor\Module\Model\Config\Source;
use Magento\Framework\Option\ArrayInterface;
class Foolist implements ArrayInterface
{
 public function toOptionArray()
 {
 $arr = array (
 1 => "foo",
 2 => "bar",
 4 => "toto",
 6 => "Bla"
 );
 $ret = [];
 foreach ($arr as $key => $value)
 {
 $ret[] = [
 'value' => $key,
 'label' => $value
 ];
 }
 return $ret;
 }
}

I manage to get the memorized selected values using (in Model):

$Entries = $this->_scopeConfig->getValue('section/group/foolist', \Magento\Store\Model\ScopeInterface::SCOPE_STORE);

Which will return for example "1,3,4", corresponding to the keys of the foolist field.

Is it possible to access the corresponding values (ie foo, toto and Bla)?

Answer 1

By default you can't. But you need some code for getting this.

Change Foolist class following way:

namespace Vendor\Module\Model\Config\Source;
use Magento\Framework\Option\ArrayInterface;
class Foolist implements ArrayInterface
{
 public $arr = array (
 1 => "foo",
 2 => "bar",
 4 => "toto",
 6 => "Bla"
 );
 public function toOptionArray()
 {
 $ret = [];
 foreach ($this->arr as $key => $value) {
 $ret[] = [
 'value' => $key,
 'label' => $value
 ];
 }
 return $ret;
 }
 public function getOriginalOption()
 {
 return $this->arr;
 }
}

Now you can use following code for getting your output result:

public function __construct(
 \Vendor\Module\Model\Config\Source\Foolist $foolist
) {
 $this->foolist = $foolist;
}

and

$entries = $this->_scopeConfig->getValue('section/group/foolist', \Magento\Store\Model\ScopeInterface::SCOPE_STORE);
$entries = explode(',', $entries);
$foolist = $this->foolist->getOriginalOption();
$result = array();
foreach($foolist as $key => $value) {
 if(in_array($key, $entries)) {
 $result[] = $value;
 }
}
print_r($result);