Sometimes, I don't know exactly in which conditions, whether it's browser or operating system related.

The errors I get are stated bellow:
[21-Jul-2008 14:39:34] PHP Notice: Undefined offset: 9 in /x/xx/xxx/browser_detection_php_ar-1.txt on line 446
[21-Jul-2008 14:39:34] PHP Notice: Undefined offset: 10 in /x/xx/xxx/browser_detection_php_ar-1.txt on line 446
[21-Jul-2008 14:39:34] PHP Notice: Undefined offset: 11 in /x/xx/xxx/browser_detection_php_ar-1.txt on line 446
[21-Jul-2008 14:39:34] PHP Notice: Undefined offset: 12 in /x/xx/xxx/browser_detection_php_ar-1.txt on line 446
[21-Jul-2008 14:39:34] PHP Notice: Undefined offset: 13 in /x/xx/xxx/browser_detection_php_ar-1.txt on line 446
[21-Jul-2008 14:39:34] PHP Notice: Undefined offset: 14 in /x/xx/xxx/browser_detection_php_ar-1.txt on line 446
[21-Jul-2008 14:39:34] PHP Notice: Undefined offset: 15 in /x/xx/xxx/browser_detection_php_ar-1.txt on line 446
[21-Jul-2008 14:39:34] PHP Notice: Undefined offset: 16 in /x/xx/xxx/browser_detection_php_ar-1.txt on line 446
[21-Jul-2008 14:39:34] PHP Notice: Undefined offset: 17 in /x/xx/xxx/browser_detection_php_ar-1.txt on line 446
[21-Jul-2008 14:39:34] PHP Notice: Undefined offset: 18 in /x/xx/xxx/browser_detection_php_ar-1.txt on line 446
[21-Jul-2008 14:39:34] PHP Notice: Undefined offset: 19 in /x/xx/xxx/browser_detection_php_ar-1.txt on line 446

I did some (superficial) debugging and changed four lines of code and got rid of the problem while maintaining the script functionality.

The lines I changed are:
550: $i_count1 = count($s_os);
551: for ($j = 0; $j < $i_count1; $j++)

565: $i_count2 = count($s_os); even though it could also be 1
566: for ($j = 0; $j < $i_count2; $j++) even though it could also be 1

I didn't do a in depth investigation but I got rid of the problem.
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