PHP #2

pipeline.php

<?php
/**As part of a data processing pipeline, complete the implementation of the make_pipeline method:
- The method should accept a variable number of functions, and it should return a new function that accepts one parameter $arg.
- The returned function should call the first function in the make_pipeline with the parameter $arg, and call the second function with the result of the first function.
- The returned function should continue calling each function in the make_pipeline in order, following the same pattern, and return the value from the last function.
For example, Pipeline::make_pipeline(function($x) { return $x * 3; }, function($x) { return $x + 1; }, function($x) { return $x / 2; }) then calling the returned function with 3 should return 5.
**/
class Pipeline
{
    public static function make_pipeline()
    { 
        $funcs = func_get_args(); 
        return function($arg) use ($funcs)
        { 
            foreach($funcs as $function) { 
              $result = (!isset($result)) ? $function($arg) : $function($result);
            } 
            return $result;
        };
    }
}
$fun = Pipeline::make_pipeline(function($x) { return $x * 3; }, function($x) { return $x + 1; },function($x) { return $x / 2; });
echo $fun(3); # should print 5