Pipeline PHP#2

Pipeline.php

<?php
class Pipeline
{
    public static function make_pipeline(...$funcs)
    {
        return function($arg) use ($funcs)
        {
            foreach ($funcs as $func)
            {
                if(!isset($output)) 
                {
                    $output = $func($arg);
                }else{
                    $output = $func($output);
                }
            }

            return $output;
        };
    }
}

$fun = Pipeline::make_pipeline(function($x) { return $x * 3; }, function($x) { return $x + 1; },
                          function($x) { return $x / 2; });
echo $fun(3); # should print 5