Piper

Piper enhances the PHP 8.5 pipe operator (|>) with support for multi-argument functions/callables.

Background

In PHP the pipe operator (|>) works with single-argument callables, such as strlen, trim, etc..,

$nonce = random_bytes(16)
      |> base64_encode(...);       

but what if you want to use it with multi-argument callables, such as rtrim, strtr, etc..

// does not work
$nonce = random_bytes(16)
      |> base64_encode(...)
      |> strtr(..., '+/', '-_')
      |> rtrim(..., '=');       

// works but too verbose
$nonce = random_bytes(16)
      |> base64_encode(...)
      |> (fn(string $s): string => strtr($s, '+/', '-_'))
      |> (fn($s) => rtrim($s, '='));    

This is where Piper comes into play!

How it works

Piper is sort of a decorator/wrapper around a callable for the pipe operator |>.

Usage

composer require burnett01/php-piper

PSR-4 function version:

use function Burnett01\Piper\with;

$nonce = random_bytes(16)
      |> base64_encode(...)
      |> with('strtr', '+/', '-_')
      // first-class syntax
      |> with(rtrim(...), '=');

// or pipe() function

use function Burnett01\Piper\pipe;

$nonce = random_bytes(16)
      |> base64_encode(...)
      |> pipe('strtr', '+/', '-_')
      // with first-class syntax
      |> pipe(rtrim(...), '=');

PSR-4 class version:

use Burnett01\Piper\Piper as pipe;

$nonce = random_bytes(16)
      |> base64_encode(...)
      |> pipe::to('strtr', '+/', '-_')
      // or 'with' + first-class syntax
      |> pipe::with(rtrim(...), '=');       

The ellipsis ... represents the first-class callable syntax.

You can use a callable as string or first-class syntax for passing the method.

Other examples

use function Burnett01\Piper\with;

$actual = -1234.5
      |> abs(...)
      |> with(number_format(...), 2, '.', ',')
      |> urlencode(...);

Api

• Piper::to(callable $fn, mixed ...$args)

  Creates an instance of Piper for the specificed $fn.

  Parameters:

  • callable $fn - The name of a callable as string (eg. 'strlen') or as first-class syntax (eg. strlen(...))

  • variadic (mixed) $args - The arguments for $fn

  Context: static

  Returns: instance

• Piper::with(callable $fn, mixed ...$args)

  alias for Piper::to(callable $fn, mixed ...$args) (see above)

• pipe(callable $fn, mixed ...$args)

  alias for Piper::to(callable $fn, mixed ...$args) (see above)

• with(callable $fn, mixed ...$args)

  alias for Piper::to(callable $fn, mixed ...$args) (see above)