phpmysql有关问题数据库连接成功执行析构函数后后面的代码不执行什么原因

php mysql问题 数据库连接成功执行析构函数后 后面的代码不执行什么原因
/*
* class mysql
*/
class mysql_class
{
public $host;
public $root;
public $passwd;
public $database;
public $ut;
public $link;

////construct
function __construct($host,$root,$passwd,$database,$ut)
{
$this->host = $host;
$this->root = $root;
$this->passwd = $passwd;
$this->database = $database;
$this->ut = $ut;
$this->connect();
}

////destruct
function __destruct()
{
echo $this->link;
mysql_close($this->link);
echo "destruct
";
}

////mysql connect
function connect()
{
$this->link = mysql_connect($this->host,$this->root,$this->passwd);
if(!$this->link)
{
die("Could not connect".mysql_error()."
");
}
else {
echo "Connect successed
";
}
mysql_select_db($this->database,$this->link) or die("No Database:".$this->database."
");
mysql_query("SET NAME 'UTF8'");
}
}

////执行下面test1
////或执行下面test2


?>
执行test1:代码
////test1
$ms = new mysql_class("localhost","admin","admin","php1000","UTF8");
$ms = null;
echo '
mysqlclass end==
';
$con = mysql_connect ( "localhost", "admin", "admin" );
if (! $con) {
die ( 'Could not connect: ' . mysql_error () );
}
else{
echo "
11connect successed";
}
echo $con."==con
";
// 一些代码...
mysql_close($con);
//test1结果如下:（为啥结果里没有11connect successed Resource id #3==con这些内容输出）
Connect successed
No Database:php1000
Resource id #3destruct

执行test2：
////test2 代码
$con = mysql_connect ( "localhost", "admin", "admin" );
if (! $con) {
die ( 'Could not connect: ' . mysql_error () );
}
else{
echo "
11connect successed
";
}
echo $con."==con
";
// 一些代码...
mysql_close($con);
$ms = new mysql_class("localhost","admin","admin","php1000","UTF8");
$ms = null;
echo '
mysqlclass end==
';
//test2 结果：
11connect successed
Resource id #3==con
Connect successed
No Database:php1000
Resource id #5destruct

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------解决方案--------------------
mysql_select_db($this->database,$this->link) or die("No Database:".$this->database."
");
既然输出了 No Database:php1000
就表示你的程序提前结束了，后面的内容没有执行，自然就没有输出