Convert single dimensional array with optional parameters (Laravel Form::select)

any.php

<?php

// Test data
$categories = array(
    array(
        'title' => 'Cats',
        'value' => 1,
        'children' => array(
            array(
                'title' => 'Leopard',
                'value' => 2,
                'children' => array(
                    array(
                        'title' => 'Small',
                        'value' => 9
                    ),
                    array(
                        'title' => 'Big',
                        'value' => 10
                    ),
                ),
            ),
        ),
    ),
    array(
        'title' => 'Dogs',
        'value' => 3,
        'children' => array(
            array(
                'title' => 'Spaniel',
                'value' => 4,
            ),
        ),
    ),
    array(
        'title' => 'Octopus',
        'value' => 5,
    ),
    array(
        'title' => 'Horse',
        'value' => 6,
    ),
    array(
        'title' => 'Mouse',
        'value' => 7,
    ),
    array(
        'title' => 'Chicken',
        'value' => 8,
    ),
);



// Use Laravel 4 Form::select
echo Form::select('animal', ['' => 'Select...'] + array_lists($categories));
echo Form::select('animal', ['' => 'Select...'] + array_lists($categories), 5);
echo Form::select('animal', ['' => 'Select...'] + array_lists($categories, ['repeat' => 2, 'delimiter' => '-']), 8, ['id' => 'categories', 'class' => 'form-control']);

helper.php

<?php
// 1. create app/helpers.php
// 2. include in app/start/global.php
// 3. Write and use


/**
 * Convert single dimensional array with optional parameters
 * 
 * @author Sercan CAKIR <[email protected]>
 * @param  array $array
 * @param  array $options
 * @param  int   $level
 * @return array
 */
function array_lists(array $array = array(), array $options = array(), $level = 0)
{
    $data      = [];
    $repeat    = array_get($options, 'repeat', 2);
    $delimiter = array_get($options, 'delimiter', '&nbsp;');

    foreach($array as $key => $value)
    {
        $data[$value['value']] = str_repeat($delimiter, $level * $repeat) . $value['title'];

        if (is_array(array_get($value, 'children')))
        {
            $data += array_lists($value['children'], $options, $level + 1);
        }
    }

    return $data;
}