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);