PHP长时间连接数据库促成mysqlhasgoneaway

PHP长时间连接数据库造成mysql has gone away
public function connect() {
if ($this->conn == "pconn") {
//永久链接
$this->conn = mysql_pconnect($this->db_host, $this->db_user, $this->db_pwd);
} else {
//即使链接
$this->conn = mysql_connect($this->db_host, $this->db_user, $this->db_pwd);
}

if (!mysql_select_db($this->db_database, $this->conn)) {
if ($this->show_error) {
$this->show_error("数据库不可用：", $this->db_database);
}
}
mysql_query("SET NAMES $this->coding");
}

上面贴的是数据库连接的写法，请问怎么写能做到不出现错误呢？还有其他的方法吗？

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------解决方案--------------------

function dbConnect($hostname,$username,$pass,$db_name,$pconnect = 0) 

{

    $func = empty($pconnect) ? 'mysql_connect' : 'mysql_pconnect';

    

    if(!$connect) {

        $connect = @$func($hostname,$username,$pass) or die("Mysql_Error : ".mysql_error()."
Mysql Error Num : ".mysql_errno()."");

    }

    

    @mysql_select_db($db_name, $connect) or die(" Mysql_Error : ".mysql_error()."
Mysql Error Num : ".mysql_errno()."");



    return $connect;

}