src/Adapter/FileAdapter/KeyTrait.php
public function delete($key)
    {
        try {
            $this->get($key);
        } catch (KeyNotFoundException $e) {
            return false;
        }

        return $this->getClient()->delete($key);
    }
public function delete($key)
    {
        try {
            $this->get($key);
        } catch (KeyNotFoundException $e) {
            return false;
        }

        return $this->getClient()->delete($key);
    }
Removes a key.

@param string $key

@return bool True if the deletion was successful, false if the deletion was unsuccessful.

@throws \Exception