Re: Problem with mysql_real_escape_string

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On Thu, Mar 5, 2009 at 11:16 AM, Nigel Green <nigel@xxxxxxxxxxxxxx> wrote:
> Hi all,
>
> This is my first post to the list. Have been observing for a few weeks and
> have learnt a lot.
>
> I am having an issue in one of my scripts where using the
> mysql_real_escape_string function is stripping content out of my input data.
> All is working well on my local installation, but when the files are
> transferred over to the live site I am getting problems.
>
> The sample code I am using to test this is as follows:
>
> if(isset($this->mysql)) {
>    $query = "update pages set";
>    $query .= " `title` = '" . mysql_real_escape_string ($title) . "',";
>    $query .= " `text` = '" . mysql_real_escape_string ($text) . "',";
>    $query .= " where id = \"$id\"";
> }
> echo $query;
>
> The $title, $text and $id values are passed in as parameters when I call the
> method that runs the update, and if I echo them out at the top of the method
> they are all present and correct.
>
> The $mysql class variable is populated with a connection handle when I
> instantiate an instance of the class, and the code is finding the connection
> as it is building the query. On my local machine the query is built using
> the escaped values from the $_POST array, but on the live site the escaped
> values for $title and $text are blank.
>
> Any ideas on where to look for config differences? The main thing I've found
> so far is that this may happen if no connection is present, but it is. Doing
> a var_dump of the connection handle shows that it is the correct handle as
> well.
>
> Any thoughts?
>
> Many thanks in advance for any help.
>
> Nigel
>
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>
>

Make sure to always pass your active database connection into the
second parameter of mysql_real_escape_string.  There could be
character set differences between your two servers too that might be
causing issues for you.  If at all possible I would recommend
upgrading to mysqli or pdo and use prepared statements.

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