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<?php
namespace Jeremeamia\SuperClosure;
/**
* This class allows you to do the impossible - serialize closures! With the combined power of the nikic/php-parser
* library, the Reflection API, and infamous eval, you can serialize a closure, unserialize it in a different PHP
* process, and execute it. It's almost as cool as time travel!
*
* @copyright Jeremy Lindblom 2010-2013
*/
class SerializableClosure implements \Serializable
{
/**
* @var \Closure The closure being made serializable
*/
protected $closure;
/**
* @var \ReflectionFunction The reflected closure
*/
protected $reflection;
/**
* @var array The calculated state to serialize
*/
protected $state;
/**
* @param \Closure $closure
*/
public function __construct(\Closure $closure)
{
$this->closure = $closure;
}
/**
* @return \ReflectionFunction
*/
public function getReflection()
{
if (!$this->reflection) {
$this->reflection = new \ReflectionFunction($this->closure);
}
return $this->reflection;
}
/**
* @return \Closure
*/
public function getClosure()
{
return $this->closure;
}
/**
* Invokes the original closure
*
* @return mixed
*/
public function __invoke()
{
return $this->getReflection()->invokeArgs(func_get_args());
}
/**
* Serialize the code and of context of the closure
*
* @return string
*/
public function serialize()
{
if (!$this->state) {
$this->createState();
}
return serialize($this->state);
}
/**
* Unserializes the closure data and recreates the closure. Attempts to recreate the closure's context as well by
* extracting the used variables into the scope. Variables names in this method are surrounded with underlines in
* order to prevent collisions with the variables in the context. NOTE: There be dragons here! Both `eval` and
* `extract` are used in this method
*
* @param string $__serialized__
*/
public function unserialize($__serialized__)
{
// Unserialize the data we need to reconstruct the SuperClosure
$this->state = unserialize($__serialized__);
list($__code__, $__context__) = $this->state;
// Simulate the original context the Closure was created in
extract($__context__);
// Evaluate the code to recreate the Closure
eval("\$this->closure = {$__code__};");
}
/**
* Uses the closure parser to fetch the closure's code and context
*/
protected function createState()
{
$parser = new ClosureParser($this->getReflection());
$this->state = array($parser->getCode());
// Add the used variables (context) to the state, but wrap all closures with SerializableClosure
$this->state[] = array_map(function ($var) {
return ($var instanceof \Closure) ? new self($var) : $var;
}, $parser->getUsedVariables());
}
}
|
Revision |
Author |
Commited |
Message |
1464
|
MOliva
|
Tue 13 Oct, 2020 11:16:56 +0000 |
|