Multiplex¶

Multiplex ( callable $callback , array $functions )

Sends every input value to one of the inner functions based on the result of the callback function. Output is the output of the inner functions.

Parameters¶

scalar callback ( mixed $value )

A callback that returns the key of the function to which the value should be passed.

functions: An array of Pipeline functions. If any of the elements in the array is an array it will be passed as argument to Compose, which is then used as the function.

Examples¶

Example #1¶

Basic usage example.

<?php

use Webbhuset\Pipeline\Constructor as F;

$multiplex = F::Multiplex(
    function ($value) {
        return $value % 2 == 0 ? 'even' : 'odd';
    },
    [
        'even' => F::Map(function ($value) {
            return $value / 2;
        }),
        'odd' => F::Map(function ($value) {
            return $value * 2;
        }),
    ]
);

$input = [1, 2, 3, 4, 5, 6];

echo json_encode(iterator_to_array($multiplex($input)));

// Output: [2,1,6,2,10,3]

Example #2¶

By leaving a branch empty we can run functions for only some values.

<?php

use Webbhuset\Pipeline\Constructor as F;

$multiplex = F::Multiplex(
    function ($value) {
        return $value <= 10;
    },
    [
        true => F::Map(function ($value) {
            return $value * 2;
        }),
        false => [],
    ]
);

$input = [1, 22, 3, 44, 5];

echo json_encode(iterator_to_array($multiplex($input)));

// Output: [2,22,6,44,10]

See Also¶

Fork - Send every input value to multiple functions.