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<?php
namespace Bitrix\Main\Session\Legacy;
use Bitrix\Main\Application;
use Bitrix\Main\InvalidOperationException;
final class LazySessionStart implements \ArrayAccess
{
private static $instance;
public static function register(): void
{
if (self::$instance)
{
throw new InvalidOperationException("LazySessionStart was already registered.");
}
// It's very important to make a reference to the LazySessionStart object,
// because when somebody uses $_SESSION['d'] += $value;
// it converts to: offsetGet & offsetSet. But PHP destroys
// the object because it'll be the last reference and offsetSet crashes.
$_SESSION = self::$instance = new self();
}
protected function start(): void
{
if ($this->isSessionAlreadyClosed() && !Application::getInstance()->getSession()->isAccessible())
{
$this->writeToLogError(
new \RuntimeException(
"Skipped cold session start because headers have already been sent. Be aware and fix usage of session, details in trace."
)
);
$GLOBALS['_SESSION'] = [];
return;
}
Application::getInstance()->getSession()->start();
}
public function offsetExists($offset): bool
{
$this->start();
return isset($_SESSION[$offset]);
}
#[\ReturnTypeWillChange]
public function &offsetGet($offset)
{
$this->start();
return $_SESSION[$offset];
}
public function offsetSet($offset, $value): void
{
$this->start();
$_SESSION[$offset] = $value;
}
public function offsetUnset($offset): void
{
$this->start();
unset($_SESSION[$offset]);
}
private function isKernelWentSessionStart(): bool
{
return defined('BX_STARTED');
}
private function isSessionAlreadyClosed(): bool
{
return
$this->isKernelWentSessionStart()
&& !Application::getInstance()->getKernelSession()->isStarted()
;
}
private function writeToLogError(\RuntimeException $exception): void
{
$exceptionHandler = Application::getInstance()->getExceptionHandler();
$exceptionHandler->writeToLog($exception);
}
}