/**
* 递减
* @param string $key 键名
* @param int $step 递减步长
* @return int|false 递减后的值,失败返回false
*/
public function decr($key, $step = 1)
{
if ($this->driver->checkDriver()) {
if (method_exists($this->driver, 'decr')) {
return $this->driver->decr($key, $step);
} else {
if (!is_int($step)) {
return false;
}
$value = $this->driver->get($key);
if ($value !== false && !is_int($value)) {
return false;
}
if ($this->driver->set($key, $value -= $step)) {
return $value;
}
return false;
}
}
if ($this->driver->isFallback() && $this->type !== self::$config['fallback']) {
return $this->driver->backup()->decr($key, $step);
}
return false;
}
