Warning "array_or_countable" in mehtod RedisMock:del() on PHP 7.2

[rs2487]

• Version: 2.8.0
• PHP: 7.2
• Warning: "Parameter must be an array or an object that implements Countable"

Affected code:

$deletedKeyCount += count(self::$dataValues[$this->storage][$k]);

Bugfix:

$value = self::$dataValues[$this->storage][$k];
$deletedKeyCount += is_array($value) ? count($value) : 1;