解决办法：
将phpMyAdmin目录下的config.inc.php（默认为config.sample.inc.php）配置文件中的$cfg['blowfish_secret’]值随便设置为一个够32位的值（字符串）解决问题。
/**
* This is needed for cookie based authentication to encrypt password in
* cookie. Needs to be 32 chars long.
*/
$cfg['blowfish_secret’] = 'abcdefghijklmnopqrstuvwxyzabcdefgh’; /* YOU SHOULD CHANGE THIS FOR A MORE SECURE COOKIE AUTH! */
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