Re: [PHP] Classes and access to outside variables

That's incorrectly syntactically. Won't run.

----

Ok, let's write some code to show how this can be done:

class SearchHelper extends AjaxACApplication {
private $dbh;
public function __construct() {
$this->dbh = $GLOBALS['dbh'];
}
}

----

Better yet, pass the database host in the construction:

class SearchHelper extends AjaxACApplication {
private $dbh;
public function __construct($dbh) {
$this->dbh = $dbh;
}
}

$searchHelper = new SearchHelper($dbh);

----

Even better, DON'T use globals:

class DatabaseConnectionInfo {
private var $host;
...
public function getHost() {
return $this->host();
}
...
private static $defaultConnectionInfo;
public static function getDefault() {
if (self::$defaultConnectionInfo === null) {
...build default connection...
}
return self::$defaultConnectionInfo;
}
}

class SearchHelper extends AjaxACApplication {
private $dbh;
public function __construct(DatabaseConnectionInfo $connectionInfo = null)
{
if ($connectionInfo === null) {
$connectionInfo = DatabaseConnectionInfo::getDefault();
}
$this->dbh = $connectionInfo->getHost();
}
}

Yes, I know what you're thinking, too much more code for just a stupid
thing. Trust me, refactoring it's easier when the code was written right the
first time.

2007/9/30, 潘志彬 <ryu.pan@xxxxxxxxx>:

$dbh = 'test';

class search_helper extends AjaxACApplication
{
/**
* Database connection details
*/

// announce global variable before use it
global $dbh;

$db_hostname = $dbh;


...

Regards,
Ryu



2007/9/29, Merlin <ngroups@xxxxxxxxxxx>:

Hi there,

I am new to PHP classes and I do want to access a variable outside the
class, but somehow that does not work. global also does not have any
effect.

In the following example I would like to be able to access $dbh from
inside the class like I did in that example. This does not work. Can
somebody please give me a hint on the right syntax?

$dbh = 'test';

class search_helper extends AjaxACApplication
{
/**
* Database connection details
*/

var $db_hostname = $dbh;

Thank you for any help,

Merlin

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