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当php版本小于7时使用这个方法,当大于php7时使用

   secret_key = $key;        $this->pad_method =$method;        $this->iv = $iv;        $this->mode = $mode;        $this->cipher = $cipher;    }    protected function pad_or_unpad($str, $ext)    {        if (!is_null($this->pad_method)) {            $func_name = __CLASS__ . '::' . $this->pad_method . '_' . $ext . 'pad';            if (is_callable($func_name)) {                $size = mcrypt_get_block_size($this->cipher, $this->mode);                return call_user_func($func_name, $str, $size);            }        }        return $str;    }    protected function pad($str)    {        return $this->pad_or_unpad($str, '');    }    protected function unpad($str)    {        return $this->pad_or_unpad($str, 'un');    }    public function encrypt($str)    {        $str = $this->pad($str);        $td = mcrypt_module_open($this->cipher, '', $this->mode, '');        if (empty($this->iv)) {            $iv = @mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);        } else {            $iv = $this->iv;        }        mcrypt_generic_init($td, $this->secret_key, $iv);        $cyper_text = mcrypt_generic($td, $str);        $rt = base64_encode($cyper_text);        mcrypt_generic_deinit($td);        mcrypt_module_close($td);        return $rt;    }    public function decrypt($str)    {        $td = mcrypt_module_open($this->cipher, '', $this->mode, '');        if (empty($this->iv)) {            $iv = @mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);        } else {            $iv = $this->iv;        }        mcrypt_generic_init($td, $this->secret_key, $iv);        $decrypted_text = mdecrypt_generic($td, base64_decode($str));        $rt = $decrypted_text;        mcrypt_generic_deinit($td);        mcrypt_module_close($td);        return $this->unpad($rt);    }    public static function pkcs7_pad($text, $blocksize)    {        $pad = $blocksize - (strlen($text) % $blocksize);        return $text . str_repeat(chr($pad), $pad);    }    public static function pkcs7_unpad($text)    {        $pad = ord($text[strlen($text) - 1]);        if ($pad > strlen($text)) return false;        if (strspn($text, chr($pad), strlen($text) - $pad) != $pad) return false;        return substr($text, 0, -1 * $pad);    }}$aes = new AES('aa2VN#N8DAL147L');echo $aes->encrypt('一片云资源站'), '
';// We2MEs6x595hkFvSwtS05g==echo $aes->decrypt('2LzvBMMOeEzMN7piI6xitg==');

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