PHP #2 - Pipeline

Pipeline.php

<?php

class Pipeline
{
    public static function make_pipeline(...$funcs)
    {
        return function($arg) use ($funcs)
        {
            $x = $arg;

            foreach ($funcs as $func) {
                $x = call_user_func($func, $x);
            }

            return $x;
        };
    }
}

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