Set variables in blade without having them echo out

BladeExtensionServiceProvider.php

<?php namespace App\Providers;

use Illuminate\Support\Facades\Blade;
use Illuminate\Support\ServiceProvider;

class BladeExtensionServiceProvider extends ServiceProvider {

	/**
	 * Bootstrap the application services.
	 *
	 * @return void
	 */
	public function boot()
	{
        Blade::extend(function($view, $compiler) {

            /*
             * Use like :
             * @setvar('var', 'value')
             * @setvar('var', [0,2,1,5,2])
             * @setvar('a', 10)
             * @setvar('b', 20)
             * @setvar('a' $b) // $a now has $b's value
             *
             */
            $pattern = '!\@setvar\(\s*([^,]+)\s*,\s*(.+)\s*\)!';
            return preg_replace($pattern, '<?php ${$1} = $2 ?>', $view);
        });
	}

	/**
	 * Register the application services.
	 *
	 * @return void
	 */
	public function register()
	{
		//
	}

}