Laravel Eloquent lists multiple column.

User.php

<?php namespace App;

use DB;
use Illuminate\Auth\Authenticatable;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Auth\Passwords\CanResetPassword;
use Illuminate\Contracts\Auth\Authenticatable as AuthenticatableContract;
use Illuminate\Contracts\Auth\CanResetPassword as CanResetPasswordContract;

class User extends Model implements AuthenticatableContract, CanResetPasswordContract {

	use Authenticatable, CanResetPassword;

	/**
	 * The database table used by the model.
	 *
	 * @var string
	 */
	protected $table = 'users';

	/**
	 * The attributes that are mass assignable.
	 *
	 * @var array
	 */
	protected $fillable = ['name', 'email', 'password'];

	/**
	 * The attributes excluded from the model's JSON form.
	 *
	 * @var array
	 */
	protected $hidden = ['password', 'remember_token'];
	
	/**
	 * get first name and last name
	 */
	public static function getFullName()
	{
	    return self::select(DB::raw("CONCAT(first_name, ' ', last_name) AS full_name, id"))->lists('full_name', 'id');
	}
}