Opis\Closure\SerializableClosure::from PHP Метод

    public static function from(Closure $closure, $serializeThis = false)
    {
        if (static::$context === null) {
            $instance = new static($closure, $serializeThis);
        } elseif (isset(static::$context->instances[$closure])) {
            $instance = static::$context->instances[$closure];
            $instance->serializeThis = $serializeThis;
        } else {
            $instance = new static($closure, $serializeThis);
            static::$context->instances[$closure] = $instance;
        }
        return $instance;
    }

 /**
  * String representation of object
  * @link http://php.net/manual/en/serializable.serialize.php
  * @return string the string representation of the object or null
  * @since 5.1.0
  */
 public function serialize()
 {
     SerializableClosure::enterContext();
     $object = serialize(array_map(function ($value) {
         return $value instanceof Closure ? SerializableClosure::from($value) : $value;
     }, $this->factories));
     SerializableClosure::exitContext();
     return $object;
 }