Plugin could not be activated because it triggered a fatal error?

Question

Warning: Invalid argument supplied for foreach() in /.../ipn_res.php on line 28

Warning: Invalid argument supplied for foreach() in /.../ipn_cls.php on line 30

From line 28 is a foreach loop:

foreach ($paypal_ipn->paypal_post_vars as $key=>$value) {
    if (getType($key)=="string") {
        eval("\$$key=\$value;");
    }
}

From line 30 is also a foreach loop:

foreach($this->paypal_post_vars AS $key => $value) {
    if (@get_magic_quotes_gpc()) {
        $value = stripslashes($value);
    }
    $values[] = "$key" . "=" . urlencode($value);
}

And I think the root cause of the errors is this:

//This is located before foreach loop in ipn_res.php
require_once("ipn_cls.php");

$paypal_info = $HTTP_POST_VARS;
$paypal_ipn = new paypal_ipn($paypal_info);

The constructor of class paypal_ipn is passed with a non-array var because nothing has been sent yet that would fill out $HTTP_POST_VARS. Wordpress runs the code which is not the case when not in it. How do I get away from this?

Answer 1

Contact plugin's developer and ask him to fix?.. But I guess that is probably not an option if plugin is broken badly and remains that way.

For a quick band-aid try this right after object is created, to handle case of constructor not setting up field properly:

if( !isset( $paypal_ipn->paypal_post_vars ) )
    $paypal_ipn->paypal_post_vars = array();