Opis Closure

Serialize closures and anonymous classes

Opis Closure is a PHP library that allows you to serialize closures, anonymous classes, and arbitrary data.

Key features:

• serialize closures (anonymous functions)
• serialize anonymous classes
• does not rely on PHP extensions (no FFI or similar dependencies)
• supports PHP 8.0-8.5 syntax
• handles circular references
• works with attributes
• works with readonly properties
• works with property hooks
• extensible via custom serializers and deserializers
• supports cryptographically signed data
• supports PHP's built-in SPL and Date classes, and the popular nesbot/carbon package
• reconstructed code is close to the original and debugger friendly
• and many more

Example of closure serialization

use function Opis\Closure\{serialize, unserialize};

$serialized = serialize(fn() => "hello from closure!");
$greet = unserialize($serialized);

echo $greet(); // hello from closure!

Example of anonymous class serialization

use function Opis\Closure\{serialize, unserialize};

$serialized = serialize(new class("hello from anonymous class!") {
    public function __construct(private string $message) {}
    
    public function greet(): string {
        return $this->message;
    }
});

$object = unserialize($serialized);
echo $object->greet(); // hello from anonymous class!

Migrating from 3.x

Version 4.x is a full rewrite of the library, but data deserialization from 3.x is possible. Read the docs on how to migrate from 3.x.

Documentation

The full documentation for this library can be found here.

License

Opis Closure is licensed under the MIT License (MIT).

Requirements

• PHP >= 8.0

Installation

Opis Closure is available on Packagist, and it can be installed from a command line interface by using Composer:

composer require opis/closure

Or you could directly reference it into your composer.json file as a dependency

{
    "require": {
        "opis/closure": "^4.4"
    }
}