CallablesCollections.md

Callables Collection

\VersatileCollections\CallablesCollection is a Collection class that only accepts items that are callables (i.e. when is_callable is called on each item, it should return true).

Example Usage:

    $collection = new \VersatileCollections\CallablesCollection(
        function() { return 'boo'; },
        'strtolower',
        [\DateTime::class, 'getLastErrors'],
        [\DateTime::class, 'createFromFormat']
    );

    // OR

    $collection = \VersatileCollections\CallablesCollection::makeNew([
        function() { return 'boo'; },
        'strtolower',
        [\DateTime::class, 'getLastErrors'],
        [\DateTime::class, 'createFromFormat']
    ]);

    // OR

    $collection = new \VersatileCollections\CallablesCollection();

    // lines below should produce no exception since we are injecting callables
    $collection[] = function() {
        return 'boo';
    };
    $collection[] = 'strtolower';
    $collection[] = [\DateTime::class, 'getLastErrors'];
    $collection[] = [\DateTime::class, 'createFromFormat'];

A couple good use-cases for this type of collection would be for implementing a dependency-injection container class that should only contain callables or an object containing callables that can be used as view-helpers in an M-V-C framework.