There are a few errors in the PHP code you provide for the AideRSS API.
1) line 4 of function feed_id() should be: if(!isset($data['feed_id']))
2) line 5 of function feed_stats() should be: if(isset($data['error']))
3) line 16 of function entry_stats() should be : curl_setopt($curl, CURLOPT_POST, TRUE);
4) the AideException toString() function should be: return var_export($this->data);
I have a problem on subscribing, I receive the following message:
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Warning: file_put_contents(waiting-list) [function.file-put-contents]: failed to open stream: Permission denied in /home/aidegr/public_html/index.php on line 62
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