Pipeline

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, 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.

PHP 7.3.10

Show starting code

<?php

function make_pipeline(...$funcs)
{
    return function($arg) use ($funcs)
    {
        return -1;
    };
}

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

Example case: Wrong answer
Various functions: Wrong answer
Various data types: Wrong answer

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