avoid object creation...

[Roco3D]

exist a way to avoid an object creation on error??
i have this on php5.0.5

public function __construct(){
@list($this->DSN,
$this->DBuser,
$this->DBpass) = func_get_args();

$this->res =
odbc_connect($this->DSN,$this->DBuser,$this->DBpas$
if(!is_resource($this->res)){
echo odbc_error()."<br>\n".odbc_errormsg();
/// here put something to avoid contruction of the
object
}
}

in the script i have this:

$db = new DbCon('dsn','user','pass');
if(is_object($db)){
//do some
}else{
//do some
}

[Richard Levasseur]

You can throw an exception inside the constructor.
try {
$ob = new obj();
} catch(exception $e) { unset($ob) }

if(.....) { }

Though, I remember reading about memory leaks throwing an exception in
a constructor awhile back. When or if it that was fixed, I don't
recall. How it would deconstruct afterwards I don't know, either.

Better form would be to: use a factory or singleton pattern, $conn =
DB::getConnection();
a static method of the object, $conn = new DBConn($dsn);
if($conn->connect()) { ... }
or check some part of the object after created, $conn = new DBConn();
if($conn->isValid()) { .... }

Aside from out of memory errors or something beyond the object's
control, construction should never fail.