有谁知道下面这段代码是什么意思

PD9waHANCi8v6K6+572u5pWw5o2u5bqT6ZO+5o6l5L+h5oGvDQpkZWZpbmUoJ0RCX0hPU1QnLCdsb2NhbGhvc3QnKTsNCmRlZmluZSgnREJfUEFTU1dPUkQnLCcxMjMnKTsNCmRlZmluZSgnREJfVVNFUk5BTUUnLCdyb290Jyk7DQpkZWZpbmUoJ0RCX05BTUUnLCJqbSIpOw0KZGVmaW5lKCJEQl9DSEFSU0VUIiwidXRmOCIpOw0KDQpkZWZpbmUoIlJPT1QiLCJFOi93YW1wL3d3dy9qdW1laS8iKTsNCmZ1bmN0aW9uIF9fYXV0b2xvYWQoJGNsYXNzTmFtZSl7DQoJcmVxdWlyZSBST09ULiJjbGFzcy8iLiRjbGFzc05hbWUuIi5jbGFzcy5waHAiOw0KfQ==

回复讨论(解决方案)

$str = 'PD9waHANCi8v6K6+572u5pWw5o2u5bqT6ZO+5o6l5L+h5oGvDQpkZWZpbmUoJ0RCX0hPU1QnLCdsb2NhbGhvc3QnKTsNCmRlZmluZSgnREJfUEFTU1dPUkQnLCcxMjMnKTsNCmRlZmluZSgnREJfVVNFUk5BTUUnLCdyb290Jyk7DQpkZWZpbmUoJ0RCX05BTUUnLCJqbSIpOw0KZGVmaW5lKCJEQl9DSEFSU0VUIiwidXRmOCIpOw0KDQpkZWZpbmUoIlJPT1QiLCJFOi93YW1wL3d3dy9qdW1laS8iKTsNCmZ1bmN0aW9uIF9fYXV0b2xvYWQoJGNsYXNzTmFtZSl7DQoJcmVxdWlyZSBST09ULiJjbGFzcy8iLiRjbGFzc05hbWUuIi5jbGFzcy5waHAiOw0KfQ==';echo base64_decode($str);

<?php//设置数据库链接信息define('DB_HOST','localhost');define('DB_PASSWORD','123');define('DB_USERNAME','root');define('DB_NAME',"jm");define("DB_CHARSET","utf8");define("ROOT","E:/wamp/www/jumei/");function __autoload($className){	require ROOT."class/".$className.".class.php";}

$str = 'PD9waHANCi8v6K6+572u5pWw5o2u5bqT6ZO+5o6l5L+h5oGvDQpkZWZpbmUoJ0RCX0hPU1QnLCdsb2NhbGhvc3QnKTsNCmRlZmluZSgnREJfUEFTU1dPUkQnLCcxMjMnKTsNCmRlZmluZSgnREJfVVNFUk5BTUUnLCdyb290Jyk7DQpkZWZpbmUoJ0RCX05BTUUnLCJqbSIpOw0KZGVmaW5lKCJEQl9DSEFSU0VUIiwidXRmOCIpOw0KDQpkZWZpbmUoIlJPT1QiLCJFOi93YW1wL3d3dy9qdW1laS8iKTsNCmZ1bmN0aW9uIF9fYXV0b2xvYWQoJGNsYXNzTmFtZSl7DQoJcmVxdWlyZSBST09ULiJjbGFzcy8iLiRjbGFzc05hbWUuIi5jbGFzcy5waHAiOw0KfQ==';echo base64_decode($str);

<?php//设置数据库链接信息define('DB_HOST','localhost');define('DB_PASSWORD','123');define('DB_USERNAME','root');define('DB_NAME',"jm");define("DB_CHARSET","utf8");define("ROOT","E:/wamp/www/jumei/");function __autoload($className){	require ROOT."class/".$className.".class.php";}

正解！请问你是怎么看出来的？

$str = 'PD9waHANCi8v6K6+572u5pWw5o2u5bqT6ZO+5o6l5L+h5oGvDQpkZWZpbmUoJ0RCX0hPU1QnLCdsb2NhbGhvc3QnKTsNCmRlZmluZSgnREJfUEFTU1dPUkQnLCcxMjMnKTsNCmRlZmluZSgnREJfVVNFUk5BTUUnLCdyb290Jyk7DQpkZWZpbmUoJ0RCX05BTUUnLCJqbSIpOw0KZGVmaW5lKCJEQl9DSEFSU0VUIiwidXRmOCIpOw0KDQpkZWZpbmUoIlJPT1QiLCJFOi93YW1wL3d3dy9qdW1laS8iKTsNCmZ1bmN0aW9uIF9fYXV0b2xvYWQoJGNsYXNzTmFtZSl7DQoJcmVxdWlyZSBST09ULiJjbGFzcy8iLiRjbGFzc05hbWUuIi5jbGFzcy5waHAiOw0KfQ==';echo base64_decode($str);

<?php//设置数据库链接信息define('DB_HOST','localhost');define('DB_PASSWORD','123');define('DB_USERNAME','root');define('DB_NAME',"jm");define("DB_CHARSET","utf8");define("ROOT","E:/wamp/www/jumei/");function __autoload($className){	require ROOT."class/".$className.".class.php";}

正解！请问你是怎么看出来的？
看到等号结尾 猜的