It appears that the PHP source code for SIG is quite buggy.
Lines 80, 81 and 82 of the source code start with
if(!$gdinfo['some string'])
That should be changed to
if(empty($gdinfo['some string']))
The ereg_replace (non-PCRE regular expression replacement) function (on line 78) should be replaced with preg_replace, as the former is deprecated from PHP version 5.3. I suspect the fix might be to:
Replace on line 78:
ereg_replace('[[:alpha:][:space:]()]+'with:
On line 83, replace:
with:
