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回复讨论(解决方案)
Home Backend Development PHP Tutorial 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

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

Jun 23, 2016 pm 02:40 PM

/*
 * 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


回复讨论(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

谢谢楼上大神的提醒

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