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Re: Magic quotes? Should I still be cautious? [message #176395 is a reply to message #176378] Fri, 30 December 2011 13:42 Go to previous messageGo to previous message
Erwin Moller is currently offline  Erwin Moller
Messages: 228
Registered: September 2010
Karma:
Senior Member
On 12/29/2011 9:55 PM, Michael Joel wrote:
> I do not have control of my server (shared server).
>
> echo get_magic_quotes_gpc(); returns True.
> Should I still be cautious and use addslashes/stripslashes in case the
> hosting company ever decides to change the settings?
>
> Thanks
> Mike

Hi Mike,

To sum up all the responses so far:
1) Avoid all use of magic_quotes in your code. Do not rely on it.
2) If you want your programs to be prepared for magic_quotes, as in
older shared hosting environments like yours, write a small function to
wrap the test in, like:

function getRawGPCValue($someGPCStr){
if (get_magic_quotes_gpc() === 1){
return stripslashes($someGPCStr);
} else {
return $someGPCStr;
}
}

And then when you need a value from $_POST, simply do:
$firstName = getRawGPCValue($_POST("firstname"));

You might want to use a shorter functionname. ;-)


3) When you need to use the value from sources like GPC, simply do the
right thing with the *raw* data.

For example:
a) When you expect an integer, don't mind the escaping, simply cast it
to integer:
$userid = (int)$_POST["userid"];
(You might want to add additional checks of course, like rnage of the
number, if $_POST["userid"] is set at all, etc.)

b) When you want to output it to HTML:
$firstName = getRawGPCValue($_POST("firstname"));
echo htmlentities($firstName);
For more details like charset/encoding read here:
http://nl3.php.net/manual/en/function.htmlentities.php

c) When you want to insert characterdata into your database:
Use the right escape function suitable for your database, or use
something like PDO.
eg: mysql_real_escape_string() for mysql
pg_escape_literal() for Postgres.
etc.

d) When using in an URL, url encode the raw data.


etc. etc. etc.


Bottomline: Make sure you have the raw (real) data, and use the
appropriate approach before using.
There is no "magic" solution that solves all possible situations,
despite names like "magic_quotes".
Escaping of strings works differently for URLs, HTML, databaseX, databaseY,

Tip:
When the encoding of some string is different than for example the
receiving database, have a look at iconv. It saved me a few headaches.
http://nl3.php.net/manual/en/function.iconv.php

Good luck!

regards,
Erwin Moller


--
"That which can be asserted without evidence, can be dismissed without
evidence."
-- Christopher Hitchens

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