PHP and MySQL

Hi,

I'm pentesting a web site and i get the following
error message while using a single quote: ex.
/confirm.php?conf='test123

Warning: mysql_fetch_row(): supplied argument is not a
valid MySQL result resource in /xx/xx/confirm.php on
line 5

I've looked up the error and attemped numerous
variations like '1==1; etc... but i always get the
same error.

As anyone been succesful in getting information this
way ? If so how?

And how do we fix this vulnerability ? Besides the PHP
code itself (sanitize user input), is it a PHP setting
(php.ini) ?

Thanks for your help

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