https://github.com/xp-lang/php-is-operator

Is operator for PHP
https://github.com/xp-lang/php-is-operator

compiler-plugin is-operator php7 php8 xp-compiler xp-framework

Last synced: about 1 month ago
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Is operator for PHP

• Host: GitHub
• URL: https://github.com/xp-lang/php-is-operator
• Owner: xp-lang
• Created: 2019-09-09T18:12:25.000Z (over 6 years ago)
• Default Branch: master
• Last Pushed: 2025-12-22T08:01:46.000Z (3 months ago)
• Last Synced: 2025-12-23T05:39:46.221Z (3 months ago)
• Topics: compiler-plugin, is-operator, php7, php8, xp-compiler, xp-framework
• Language: PHP
• Homepage:
• Size: 65.4 KB
• Stars: 1
• Watchers: 2
• Forks: 0
• Open Issues: 2
• Metadata Files:
  • Readme: README.md
  • Changelog: ChangeLog.md

Awesome Lists containing this project

README

          
Is operator for PHP

===================

[![Build status on GitHub](https://github.com/xp-lang/php-is-operator/workflows/Tests/badge.svg)](https://github.com/xp-lang/php-is-operator/actions)

[![XP Framework Module](https://raw.githubusercontent.com/xp-framework/web/master/static/xp-framework-badge.png)](https://github.com/xp-framework/core)

[![BSD Licence](https://raw.githubusercontent.com/xp-framework/web/master/static/licence-bsd.png)](https://github.com/xp-framework/core/blob/master/LICENCE.md)

[![Requires PHP 7.4+](https://raw.githubusercontent.com/xp-framework/web/master/static/php-7_4plus.svg)](http://php.net/)

[![Supports PHP 8.0+](https://raw.githubusercontent.com/xp-framework/web/master/static/php-8_0plus.svg)](http://php.net/)

[![Latest Stable Version](https://poser.pugx.org/xp-lang/php-is-operator/version.svg)](https://packagist.org/packages/xp-lang/php-is-operator)

Plugin for the [XP Compiler](https://github.com/xp-framework/compiler/) which adds an `is` operator to the PHP language.

Before

------

A mix of functions, syntax and XP core functionality `is()`:

```php

is_string($value)                                  // for primitives, use is_[T]()

is_callable($value)                                // for pseudo types callable, array, object

is_array($value) || $value instanceof \Traversable // no is_iterable in PHP 5 and 7.0 

$value instanceof Date                             // for value types

null === $value || is_int($value)                  // nullable types cannot be tested directly

is('[:string]', $value)                            // for types beyond PHP type system

is('string|util.URI', $value)                      // for types beyond PHP type system

```

After

-----

Anything that works as a parameter, property or return type can be used with the `is` operator.

```php

$value is string

$value is callable

$value is iterable

$value is Date

$value is ?int

$value is array

$value is string|URI

```

Installation

------------

After installing the XP Compiler into your project, also include this plugin.

```bash

$ composer require xp-framework/compiler

# ...

$ composer require xp-lang/php-is-operator

# ...

```

No further action is required.

See also

--------

* https://wiki.php.net/rfc/pattern-matching

* https://docs.hhvm.com/hack/expressions-and-operators/is

* https://kotlinlang.org/docs/reference/typecasts.html

* https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/is

* https://externals.io/message/120655 (Proposal to introduce is operator)