Add orderByRandom() to Laravel query builder

orderByRandom.php

<?php

// github.com/laravel/framework/issues/5223
// github.com/laravel/framework/pull/5435

use Illuminate\Database\Query\Builder;

Builder::macro('orderByRandom', function () {

	$randomFunctions = [
		'mysql'  => 'RAND()',
		'pgsql'  => 'RANDOM()',
		'sqlite' => 'RANDOM()',
		'sqlsrv' => 'NEWID()',
	];

	$driver = $this->getConnection()->getDriverName();

	return $this->orderByRaw($randomFunctions[$driver]);
});