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Example code of chrisharrison/php-array-of

Informations about the package php-array-of

php-array-of

Build Status

Implement an array of a defined type. Generics replacement for PHP.

Requirements

Requires PHP >= 7.1

Installation

Through Composer, obviously:

Why?

PHP 7 has pretty good support for type declarations, both in arguments and returns. It now also handles primitives as well as class names. For example:

One thing is still lacking. Array generics. There's an RFC for implementing 'Array Of'. It's been around for quite a while and was roundly rejected.

This library is a workaround for that. It allows you to make type declarations for arrays of a particular type.

Usage

Using an existing implementation

The library comes with ArrayOf implementations for all of the PHP scalar types. i.e.:

These can then be used in a type declaration:

An ArrayOfInteger can be created:

and used like an array:

Implementing your own type

You can create your own ArrayOfs for your own types.

An ArrayOfCard can be created thus:

Other concerns

Enforcement

Members of an ArrayOf are enforced as being of the type specified in the typeToEnforce abstract method. This enforcement occurs on instantiation at runtime. If you try to instantiate with a member of a non-matching type, an exception will be thrown.

Permissible types

Only PHP scalars and objects can be members of an ArrayOf. So no callables and no arrays.

Immutability

ArrayOfs are mutable. This library provides the capability to define immutable objects in the form of ImmutableArrayOfs. These objects extend from ArrayOf and work in the same way except after the initial instantiation, no further changes can be made to the object. If you try to perform a write operation (e.g. unset) on it, an exception will be thrown. All of the scalar types are also provided in immutable form:

All versions of php-array-of with dependencies

PHP Build Version
Package Version
Requires php Version ^7.1 || ^8.0
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