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

            foreach($funcs as $function) {
                if(!isset($value))
                    $value = $function($arg);
                else
                    $value = $function($value);
            }
            return $value;
        };
    }
}

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