CapTwigExtension.php

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<?php

namespace Paperyard\Helpers;

class CapTwigExtension extends \Twig_Extension
{

    public function getFilters()
    {
        return array(
            'cap' => new \Twig_SimpleFilter('cap', array($this, 'cap'))
        );
    }

    public function cap($value, $cap)
    {
        return ($value > $cap ? $cap : $value);
    }

    public function getName()
    {
        return 'cap_extention';
    }
}