Re: Single Quotes in Form Inputs

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Michael A. Peters wrote:
> Bastien Koert wrote:
>> On Mon, Jul 27, 2009 at 12:41 PM, Mari Masuda<mbmasuda@xxxxxxxxxxxx>
>> wrote:
>>> You need to sanitize and escape the input before inserting it into
>>> the db.
>>>  You can use http://us.php.net/mysql_real_escape_string to escape the
>>> input.
>>>
>>> On Jul 27, 2009, at 09:35, Ben Miller wrote:
>>>
>>>> Hi,
>>>>
>>>>
>>>>
>>>> I have a form in which my sales reps can add new clients into the
>>>> database,
>>>> but I'm running into a problem if the client's name includes a single
>>>> quote,
>>>> such as O'Henry, when it comes time to input the form data into the
>>>> database
>>>> table.  I'm guessing I need to use ereg_replace, or something
>>>> similar, to
>>>> change the single quote, but I still can't seem to get the syntax
>>>> right.
>>>> Any help would be appreciated.  For what it's worth, here is a
>>>> shortened
>>>> version of what I have:
>>>>
>>>>
>>>>
>>>> $ firstName = "$_POST[form_firstName]";
>>>>
>>>> $ lastname = "$_POST[form_lastName]";
>>>>
>>>>
>>>>
>>>> $query = mysql_query("INSERT INTO customers (`cust_first`,`cust_last`)
>>>> VALUES ('$firstName','$lastName')");
>>>>
>>>>
>>>>
>>>> Ben Miller
>>>>
>>>>
>>>>
>>>
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>>>
>>
>> I like to use http://ca3.php.net/manual/en/function.htmlentities.php
>>
> 
> htmlentities should not be used on the data before it goes into the
> database. If used it should be used on data coming out of the database.
> 

To summarize:

You should prep your data for insertion into the data by using a tool
that formats it strictly for the database.  In the ops case
mysql_real_escape_string() is the correct tool for the job.

htmlentities() is a presentation sanitizing/cleaning tool.  But, it
should only be used for output to the browser, etc...  Same thing with
htmlspecialchars() and all other related function.



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