PHP 常用类分享（记录）

摘要：加密解密类由于开始废弃传统的加密函数而改用，因此该类支持的版本为简易加解密类通用秘钥所有可用的加密类型可参考构造函数加密类型。

由于 PHP7.1 开始废弃传统的加密函数 mcrypt_encrypt 而改用 openssl_encrypt，因此该类支持的 PHP 版本为： (PHP 5 >= 5.3.0, PHP 7)

</>复制代码 
METHOD = $method;
        }
    }
    /**
        * 加密字符串
        *
        * @param String 待加密数据
        * @param string 加密秘钥，若为空，则使用通用秘钥
        * @return void
        */
    public function encrypt($input, $key = "") {
        if (empty($key)) $key = $this->KEY;
        $data = openssl_encrypt($input, $this->METHOD, $key, OPENSSL_RAW_DATA);
        $data = base64_encode($data);
        return $data;
    }
    /**
        * 解密字符串
        *
        * @param String 待解密字符串
        * @param string 解密秘钥，若为空，则使用通用秘钥
        * @return void
        */
    public function decrypt($input, $key = "") {
        if (empty($key)) $key = $this->KEY;
        $data = openssl_decrypt(base64_decode($input), $this->METHOD, $key, OPENSSL_RAW_DATA);
        return $data;
    }
}

先下载 PHPMailer，解压后，将其放置你的项目中，并修改类中的引入路径。

</>复制代码 
_init();
        $this->_baseURL = $_SERVER["REQUEST_SCHEME"] . "://" . $_SERVER["HTTP_HOST"];
    }
    private function _init() {
        if ($this->_email == null) {
            $mail = new PHPMailer(true);
            try {
                $mail->SMTPDebug = 0;
                $mail->isSMTP();
                $mail->Host = get_global_config("mail.Host");
                $mail->SMTPAuth = true;
                $mail->Username = get_global_config("mail.Username");
                $mail->Password = get_global_config("mail.Password");
                $mail->SMTPSecure = get_global_config("mail.SMTPSecure");
                $mail->Port = get_global_config("mail.Port");
                $mail->setFrom(get_global_config("mail.Username"), get_global_config("mail.Fromname"));
                $this->_email = $mail;
                return true;
            } catch (Exception $e) {
                // return null;
                return false;
            }
        }
        return true;
    }
    public function sendEmail($toEmail, $toUsername, $subject, $body) {
        if (!$this->_email) return false;
        try {
            $this->_email->addAddress($toEmail, $toUsername);
            $this->_email->isHTML(true);
            $this->_email->Subject = $subject;
            $this->_email->Body    = $body;
            // 当邮件不支持 HTML 时显示的邮件内容
            $this->_email->AltBody = $body;
        
            $this->_email->send();
            // echo "Message has been sent";
            return true;
        } catch (Exception $e) {
            return false;
            // echo "Message could not be sent.";
            // echo "Mailer Error: " . $this->_email->ErrorInfo;
        }
    }
}

使用 Redis 模拟进程锁，参考至 discuz 的进程锁源码。

</>复制代码 
cache = Roc::redis();
        $this->cache->select(Roc::get("redis.db"));
    }
    /**
     * 是否被锁
     *
     * @param string 锁名
     * @param integer 上锁时间
     * @return boolean
     */
    public function islocked($process, $ttl = 0) {
        $ttl = $ttl < 1 ? 600 : intval($ttl);
        return $this->_status("get", $process) || $this->_find($process, $ttl);
    }
    /**
     * 解锁
     *
     * @param string 锁名
     * @return void
     */
    public function unlock($process) {
        $this->_status("rm", $process);
        $this->_cmd("rm", $process);
    }
    private function _status($action, $process) {
        static $plist = array();
        switch ($action) {
            case "set" : $plist[$process] = true; break;
            case "get" : return !empty($plist[$process]); break;
            case "rm" : $plist[$process] = null; break;
            case "clear" : $plist = array(); break;
        }
        return true;
    }
    private function _find($name, $ttl) {
        if(!$this->_cmd("get", $name)) {
            $this->_cmd("set", $name, $ttl);
            $ret = false;
        } else {
            $ret = true;
        }
        // $this->_status("set", $name);
        return $ret;
    }
    private function _cmd($cmd, $name, $ttl = 0) {
        return $this->_process_cmd_memory($cmd, $name, $ttl);
        // static $allowmem;
        // if($allowmem === null) {
        //     $allowmem = Roc::get("redis.db");
        // }
        // if($allowmem) {
        //     return self::_process_cmd_memory($cmd, $name, $ttl);
        // } else {
        //     return false;
        //     // return self::_process_cmd_db($cmd, $name, $ttl);
        // }
    }
    private function _process_cmd_memory($cmd, $name, $ttl = 0) {
        $ret = "";
        $name = "process_lock_".$name;
        switch ($cmd) {
            case "set" :
                $ret = $this->cache->setex($name, time(), $ttl);
                // $ret = memory("set", "process_lock_".$name, time(), $ttl);
                break;
            case "get" :
                $ret = $this->cache->get($name);
                // $ret = memory("get", "process_lock_".$name);
                break;
            case "rm" :
                $ret = $this->cache->delete($name);
                // $ret = memory("rm", "process_lock_".$name);
        }
        echo $cmd . ":";
        var_dump($ret);
        return $ret;
    }
    private function _process_cmd_db($cmd, $name, $ttl = 0) {
        $ret = "";
        switch ($cmd) {
            case "set":
                $ret = C::t("common_process")->insert(array("processid" => $name, "expiry" => time() + $ttl), FALSE, true);
                break;
            case "get":
                $ret = C::t("common_process")->fetch($name);
                if(empty($ret) || $ret["expiry"] < time()) {
                    $ret = false;
                } else {
                    $ret = true;
                }
                break;
            case "rm":
                $ret = C::t("common_process")->delete_process($name, time());
                break;
        }
        return $ret;
    }
}

一个简易的 Redis 操作类，支持在查找不到缓存时，进行相对应的回调操作。

</>复制代码 
cache = new Redis();
    }
    // ============= String 操作
    /**
     * 设置缓存
     *
     * @param String 缓存key值
     * @param String/Object 缓存数据，可为字符串可为数组。
     * @param Int 过期时间
     * @return Boolean
     */
    public function set($key, $value, $ttl = null) {
        if (is_array($value)) $value = serialize($value);
        if ($ttl !== null && $ttl > 0)
            return $this->cache->setex($this->_key($key), $ttl, $value);
        else
            return $this->cache->set($this->_key($key), $value);
    }
    /**
     * 获取缓存数据
     *
     * @param String 值
     * @param Data 默认值，设置后，如果缓存没有数据则返回默认值
     * @return Data
     */
    public function get($key, $callback = false) {
        $res = $this->cache->get($this->_key($key));
        if ($res === false && $callback === true) {
            $method_name = "_$key";
            if (method_exists($this, $method_name)) {
                return $this->$method_name();
            } else {
                return false;
            }
            
        }
        // 如果反序列化成功，则返回反序列化的数据。
        // @防止报 warning。
        if (@unserialize($res) !== false) return unserialize($res);
        return $res;
    }
    /**
     * 删除缓存
     *
     * @param String 需要删除的键名
     * @return true or false
     */
    public function rm($key) {
        return $this->cache->delete($this->_key($key));
    }
    public function inc($key, $step = 1) {
        return $this->cache->incr($this->_key($key), $step);
    }
    public function dec($key, $step = 1) {
        return $this->cache->decr($this->_key($key), $step);
    }
    private function _key($key) {
        return $this->prefix . $key;
    }
    public function getMultiple($keys) {
        $_keys = [];
        foreach ($keys as $key) $_keys[] = $this->_key($key);
        return $this->cache->getMultiple($_keys);
    }
    // ============== Hash 操作
    public function hset($hash, $key, $value) {
        return $this->cache->hSet($hash, $key, $value);
    }
    public function hget($hash, $key) {
        return $this->cache->hGet($hash, $key);
    }
    public function hgetall($hash) {
        return $this->cache->hGetAll($hash);
    }
    public function hvals($hash) {
        return $this->cache->hVals($hash);
    }
    public function hkeys($hash) {
        return $this->cache->hKeys($hash);
    }
    // ================ 通用回调
    // Your callback code here.
}