link intelligence in PHP

Anon

Hello my hope,

First of all i'm a beginner in PHP!

I used this instruction below to parse some variables to the next page. Now, how can i read those variables at once in that particular page with PHP.
Sorry for my poor english!

printf("<a href='cat%s.php3?$value?$gebruikersnaam'>\n", $row["Cat_ID"], $row["Description"]);

Tx Bart

Anon

Lots of little problems here.

First of all, unless it's just a typo, I can only see a
single %s in the format string, but there's two
additional parameters, so there's nowhere for that
additional parameter to go. This is one of the
shortcomings of printf(); you are almost always
better off using print or echo since then your
statement reads simply from left to right -- unless
you absolutely need the formatting capabilities of
printf (e.g. displaying a number with leading zeros.)

Second, you're leaving out the equals sign between the
name of the variable and its value in the href. In addition,
it's not clear from your code fragment whether $value
contains the name of the variable (in which case
that part of the code is correct) or if you're leaving
out the variable names.

Finally, you're omiting quotes around the name of the
link. While it's possible that some browsers may accept
this, it's not really correct html. Your tag should read like
one of the following (after the variables are
interpolated):

In other words, the parameters are separated from the url
itself by a question mark. Each parameter consists of 'name=value',
and multiple parameters are separated by an ampersand (&amp😉.
If you have a question mark, equals sign, or ampersand embedded
into the name or the value, it will mess things up, so be sure to
call rawurlencode() first, especially for the values.

Anon

Hello

Thanks for helping me!

When i run the script, the following information appears.
http://www.mydomain.com/cat1.php3/value=vink001

this is the code:
printf("<a href='cat%s.php3?value=$username' target='leftFrame'>%s</a>\n", $row["Cat_ID"], $row["Description"]);

So, the next thing is that i want to use the value VINK001 in the script CAT1.php3.
What kind of code is needed in the script CAT1.php3 to read this?

Tx Bart

Anon

Are you typing this by hand, or cutting and pasting? There
is a discrepancy here; the '?' should show up in the url, too.
I.e. the following code:

  printf("<a href='cat%s.php3?value=$username'...

should result in the following url:

  http://www.mydomain.com/cat1.php3?value=vink001

rather than what you wrote:

  http://www.mydomain.com/cat1.php3/value=vink001

Having resolved that, access the variable inside cat1.php3 is easy.
If you have track_vars turned on, the variable $value will be
created automatically. If it's not on, you can still access it as
part of the $HTTP_GET_VARS array:

  echo $HTTP_GET_VARS['value'];

One final point, sorry if I already mentioned this, but you should be
enclosing the href value in quotes e.g.

  printf("<a href=\"cat%s.php3?value=$username\"...

It's not just a good idea, it's the standard.