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Code Analyzer Output:

Variable $errno was used before it was defined (line 221)
Variable $errstr was used before it was defined (line 221)

Category: Coding Style

A local variable is used before it is defined.
Even though PHP initializes variables with empty values on the first use,
it is considered a good practice to explicitly initialize variables
to make code more readable and avoid unnecessary bugs.

enrol/authorize/authorizenetlib.php

@@ -217,6 +217,7 @@ function authorize_action(&$order, &$message, &$extra, $action=AN_ACTION_NONE, $
         $referer = "Referer: $CFG->an_referer\r\n";
     }
 
+    $errno = 0; $errstr = '';
     $host = $test ? 'certification.authorize.net' : 'secure.authorize.net';
     $fp = fsockopen("ssl://$host", 443, $errno, $errstr, 60);
     if (!$fp) {