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<?php namespace SuperClosure;
use SuperClosure\Exception\ClosureUnserializationException;
/**
* This class acts as a wrapper for a closure, and allows it to be serialized.
*
* With the combined power of the Reflection API, code parsing, and the infamous
* `eval()` function, you can serialize a closure, unserialize it somewhere
* else (even a different PHP process), and execute it.
*/
class SerializableClosure implements \Serializable
{
/**
* The closure being wrapped for serialization.
*
* @var \Closure
*/
private $closure;
/**
* The serializer doing the serialization work.
*
* @var SerializerInterface
*/
private $serializer;
/**
* The data from unserialization.
*
* @var array
*/
private $data;
/**
* Create a new serializable closure instance.
*
* @param \Closure $closure
* @param SerializerInterface|null $serializer
*/
public function __construct(
\Closure $closure,
SerializerInterface $serializer = null
) {
$this->closure = $closure;
$this->serializer = $serializer ?: new Serializer;
}
/**
* Return the original closure object.
*
* @return \Closure
*/
public function getClosure()
{
return $this->closure;
}
/**
* Delegates the closure invocation to the actual closure object.
*
* Important Notes:
*
* - `ReflectionFunction::invokeArgs()` should not be used here, because it
* does not work with closure bindings.
* - Args passed-by-reference lose their references when proxied through
* `__invoke()`. This is is an unfortunate, but understandable, limitation
* of PHP that will probably never change.
*
* @return mixed
*/
public function __invoke()
{
return call_user_func_array($this->closure, func_get_args());
}
/**
* Serializes the code, context, and binding of the closure.
*
* @see http://php.net/manual/en/serializable.serialize.php
*
* @return string|null
*/
public function serialize()
{
try {
$this->data = $this->data ?: $this->serializer->getData($this->closure, true);
return serialize($this->data);
} catch (\Exception $e) {
trigger_error(
'Serialization of closure failed: ' . $e->getMessage(),
E_USER_NOTICE
);
// Note: The serialize() method of Serializable must return a string
// or null and cannot throw exceptions.
return null;
}
}
/**
* Unserializes the closure.
*
* Unserializes the closure's data and recreates the closure using a
* simulation of its original context. The used variables (context) are
* extracted into a fresh scope prior to redefining the closure. The
* closure is also rebound to its former object and scope.
*
* @see http://php.net/manual/en/serializable.unserialize.php
*
* @param string $serialized
*
* @throws ClosureUnserializationException
*/
public function unserialize($serialized)
{
// Unserialize the data and reconstruct the SuperClosure.
$this->data = unserialize($serialized);
$this->reconstructClosure();
if (!$this->closure instanceof \Closure) {
throw new ClosureUnserializationException(
'The closure is corrupted and cannot be unserialized.'
);
}
// Rebind the closure to its former binding, if it's not static.
if (!$this->data['isStatic']) {
$this->closure = $this->closure->bindTo(
$this->data['binding'],
$this->data['scope']
);
}
}
/**
* Reconstruct the closure.
*
* HERE BE DRAGONS!
*
* The infamous `eval()` is used in this method, along with `extract()`,
* the error suppression operator, and variable variables (i.e., double
* dollar signs) to perform the unserialization work. I'm sorry, world!
*/
private function reconstructClosure()
{
// Simulate the original context the closure was created in.
extract($this->data['context'], EXTR_OVERWRITE);
// Evaluate the code to recreate the closure.
if ($_fn = array_search(Serializer::RECURSION, $this->data['context'], true)) {
@eval("\${$_fn} = {$this->data['code']};");
$this->closure = $$_fn;
} else {
@eval("\$this->closure = {$this->data['code']};");
}
}
/**
* Returns closure data for `var_dump()`.
*
* @return array
*/
public function __debugInfo()
{
return $this->data ?: $this->serializer->getData($this->closure, true);
}
}