PHP Mcrypt加密解密

<?php
class Mcrypt
{
	/**
	 * 解密
	 * 
	 * @param string $encryptedText 已加密字符串
	 * @param string $key  密钥
	 * @return string
	 */
	public static function _decrypt($encryptedText,$key = null)
	{
		$key = $key === null ? "key:111" : $key;
		$cryptText = base64_decode($encryptedText);
		$ivSize = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
		$iv = mcrypt_create_iv($ivSize, MCRYPT_RAND);
		$decryptText = mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $key, $cryptText, MCRYPT_MODE_ECB, $iv);
		return trim($decryptText);
	}

	/**
	 * 加密
	 *
	 * @param string $plainText	未加密字符串 
	 * @param string $key		 密钥
	 */
	public static function _encrypt($plainText,$key = null)
	{
		$key = $key === null ? "key:111" : $key;
		$ivSize = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
		$iv = mcrypt_create_iv($ivSize, MCRYPT_RAND);
		$encryptText = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $key, $plainText, MCRYPT_MODE_ECB, $iv);
		return trim(base64_encode($encryptText));
	}
}



class Cookie extends Mcrypt
{
	/**
	 * 删除cookie
	 * 
	 * @param array $args
	 * @return boolean
	 */
	public static function del($args)
	{
		$name = $args['name'];
		$domain = isset($args['domain']) ? $args['domain'] : null;
		return isset($_COOKIE[$name]) ? setcookie($name, '', time() - 86400, '/', $domain) : true;
	}
	
	/**
	 * 得到指定cookie的值
	 * 
	 * @param string $name
	 */
	public static function get($name)
	{
		return isset($_COOKIE[$name]) ? parent::_decrypt($_COOKIE[$name]) : null;
	}
	
	/**
	 * 设置cookie
	 *
	 * @param array $args
	 * @return boolean
	 */
	public static function set($args)
	{
		$name = $args['name'];
		$value= parent::_encrypt($args['value']);
		//$value = $args['value'];
		$expire = isset($args['expire']) ? $args['expire'] : null;
		$path = isset($args['path']) ? $args['path'] : '/';
		$domain = isset($args['domain']) ? $args['domain'] : null;
		$secure = isset($args['secure']) ? $args['secure'] : 0;
		return @setcookie($name, $value, $expire, $path, $domain, $secure);
	}
}


$args["name"] = "zhangjiang";
$args['value'] = "hujia";
Cookie::set($args);
var_dump($_COOKIE);
$res = Cookie::get("zhangjiang");
echo $res;


//打印结果
array (size=4)
  '__utma' => string '111872281.1997521897.1397354342.1397354342.1397354342.1' (length=55)
  '__utmz' => string '111872281.1397354342.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none)' (length=70)
  'Hm_lvt_88c54d910a13d0a1810b9bd258902597' => string '1397354548' (length=10)
  'zhangjiang' => string 'sEeM135Ew98+rsTEs3qt7Sr7qKQyNMUPdpwA2ld/l6A=' (length=44)

hujia