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

            return $arg;
        };
    }
}

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

echo $fun(3); # should print 5