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<?php
class wfShutdownFunction {
private $callable;
private $priority;
public function __construct($callable, $priority) {
$this->callable = $callable;
$this->priority = $priority;
}
public function invoke() {
call_user_func($this->callable);
}
public function getPriority() {
return $this->priority;
}
public function __wakeup() {
$this->callable = function() {};
}
}
class wfShutdownRegistry {
private static $instance = null;
const PRIORITY_LAST = 100;
private $functions = array();
private $registered = false;
public function handleShutdown() {
usort($this->functions, function ($a, $b) {
return $a->getPriority() - $b->getPriority();
});
foreach ($this->functions as $function) {
$function->invoke();
}
}
public function register($function, $priority = 50) {
array_push($this->functions, new wfShutdownFunction($function, $priority));
$this->registerSelf();
}
private function registerSelf() {
if (!$this->registered) {
register_shutdown_function(array($this, 'handleShutdown'));
$this->registered = true;
}
}
public function __wakeup() {
$this->functions = array();
$this->registered = false;
}
public static function getDefaultInstance() {
if (self::$instance === null)
self::$instance = new self();
return self::$instance;
}
}