How to check if a class/object is loaded in php? - php

Question

I have this code:
<?php
define('ga_email', 'xxxxxxxxx#xxxxx.com'); // GA Email
define('ga_password', 'xxxxxxxxxxx'); // 2-part authorization password
define('profile_id', 'xxxxxxxxx'); // Analytics profile ID
$gapi_url = 'gapi/gapi.class.php';
require_once $gapi_url;
$ga = new gapi(ga_email,ga_password);
// here goes next code
?>
and it's ok. Gapi will load.
However, if I change ga_password from xxxxxxxxxxx to yyyyyyyyyyy (so the information for logging into GA are incorrect) I get a nasty error, that gapi is not loaded etc.
I need some if condition to implement so it checks if my object $ga was created or not and execte a code only then.
e.g.:
<?php
define('ga_email', 'xxxxxxxxx#xxxxx.com'); // GA Email
define('ga_password', 'yyyyyyyyyyyyyy'); // 2-part authorization password
define('profile_id', 'xxxxxxxxx'); // Analytics profile ID
$gapi_url = 'gapi/gapi.class.php';
require_once $gapi_url;
$ga = new gapi(ga_email,ga_password);
if($ga loaded) {
// SUCCESS
// here goes next code
} else {
// FAILURE
echo "Your connection details are wrong.";
}
?>
So, instead a bad looking PHP error I will get a nicer "Your connection details are wrong."message.

Answer 1

After looking at the source of the class, it appears that the constructor will not throw an exception when the error details are wrong, but only when the credentials are used. Wrapping all your calls to the object in a try...catch block will give you some error handling capabilities:
try {
$ga = new gapi(ga_email,ga_password);
// here goes next code
} catch (Exception $ex) {
// FAILURE
echo "Your connection details are wrong.";
// $ex->getMessage() has a detailed message
}
You also need to ensure you know the correct signature of the constructor method, which appears to be the following:
public function __construct($auth_method)

Answer 2

On your __construct() of gapi check if the username and password is valid. Also create another public function or variable to return whether it is a valid login or not.