Laravel backpack select_from_array - php

Question

I am totally confused with select_from_array field in laravel backpack.
in my controller i am using a select_from_array field where in options i call a function,but when i run the code error is displayed. please help me with this.
Error : FatalErrorException in EventController.php line 106: syntax error, unexpected '$this' (T_VARIABLE)
controller.php
public $crud = array(
"model" => "App\Larapen\Models\Event",
"entity_name" => "event",
"entity_name_plural" => "events",
"route" => "admin/event",
"reorder" => true,
"reorder_label" => "name",
"reorder_max_level" => 2,
"details_row" => true,
// *****
// COLUMNS
// *****
"columns" => [
[
'name' => "id",
'label' => "ID"
],
],
"fields" => [
[
'name' => "event_name",
'label' => "Event name",
'type' => "text",
'placeholder' => "Event Name",
],
[
'name' => "event_topic",
'label' => "Event Topic",
'type' => "text",
'placeholder' => "Event Topic",
],
[
'name' => "event_type_id",
'label' => "Event Type",
'model' => "App\Larapen\Models\EventType",
'entity' => "eventType",
'attribute' => "name",
'type' => "select",
],
[
'name' => "about_event",
'label' => "About event",
'type' => "ckeditor",
'placeholder' => "About the Event",
],
[
'name' => "country_code",
'label' => "Country",
'type' => 'select_from_array',
'options' => $this->countries(),
'allows_null' => false,
],
],
);
public function countries()
{
..................
}
Please help me with this , why this happens? how to solve this issue?
Waiting for a response................

Answer 1

You can not use the pseudo-variable $this out of class method.
http://php.net/manual/en/language.oop5.properties.php
The pseudo-variable $this is available inside any class method when that method is called from within an object context. $this is a reference to the calling object
So if you want to set the attribute of crud's with $this, you can set it in the __construct function
public function __construct()
{
$this->crud['fields'][4] = $this->countries();
}
Or initialize it the __construct function
public $crud;
public function __construct()
{
$this->crud = array(
'model' => 'App\Larapen\Models\Event',
'entity_name' => 'event',
'entity_name_plural' => 'events',
'route' => 'admin/event',
'reorder' => true,
'reorder_label' => 'name',
'reorder_max_level' => 2,
'details_row' => true,
// *****
// COLUMNS
// *****
'columns' => [
[
'name' => 'id',
'label' => 'ID'
],
],
'fields' => [
[
'name' => 'event_name',
'label' => 'Event name',
'type' => 'text',
'placeholder' => 'Event Name',
],
[
'name' => 'event_topic',
'label' => 'Event Topic',
'type' => 'text',
'placeholder' => 'Event Topic',
],
[
'name' => 'event_type_id',
'label' => 'Event Type',
'model' => 'App\Larapen\Models\EventType',
'entity' => 'eventType',
'attribute' => 'name',
'type' => 'select',
],
[
'name' => 'about_event',
'label' => 'About event',
'type' => 'ckeditor',
'placeholder' => 'About the Event',
],
[
'name' => 'country_code',
'label' => 'Country',
'type' => 'select_from_array',
'options' => $this->countries(),
'allows_null' => false,
],
],
);
}