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public $host="localhost"; //·þÎñÆ÷Ãû
public $db_name="xml"; //Êý¾Ý¿âÃû
public $username="root"; //Óû§Ãû
public $pwd="123456"; //ÃÜÂë


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$thisÖ¸µ±Ç°Àà;
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ÄãµÄ´úÂëÖеÄ$this->hostÖµµÄ¾ÍÊÇ"localhost"

class db{
  public $host="localhost";
  
  function aa(){
  echo $this->host;
  }
}

$test = new db();
$test->aa();


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