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Example code of jausions/php-typed-collections

Informations about the package php-typed-collections

Typed Collections

Type hinting is evolving but PHP 7 still does not currently provide a way to define the type of the elements of an array.

This library provides traits that can be used to implement type checking.

If you do not wish to implement anything, simply use one of the prebuilt solutions below:

For the purpose of this library, the term type is used loosely to refer to built-in PHP types, classes, and even application-domain types.

Installation

In the examples below, the require 'vendor/autoload.php'; is implied.

Simplistic Example

This example only implements the ArrayAccess PHP Predefined Interface. This means no foreach iteration, count(), and so on...

Type Defined by a Sample Value

The element validation is done against the type of a sample value.

Type Defined by a Closure

The elements added to the collection can be checked with a closure:

Type Defined by a Class Name

Objects added to the collection can be checked against a class name:

Built-In Library Types

Apart from a closure or a class name, the setElementType() method also accepts the following predefined values:

Checking a Value

If you want to know if a value would be accepted in the typed collection, you can use the isElementType() method.

Custom Type Collections

You can easily create collections by extending the base class or by including the trait into your own implementation of the ArrayAccess interface.

Remarks:

  1. We could have type hinted the enter() method with the Car class instead of the Vehicle class. This would also have thrown a \TypeError exception.
  2. I am aware that I mixed the types in the docBlock and the signature of the getCars() method. It is somewhat more legible and may help your IDE. However, the benefit may vary depending on your editor / IDE, and it may lead to confusion if trying to use some array function that expect a native array type.

All versions of php-typed-collections with dependencies

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Package Version
Requires php Version ^7.1
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