Refreshing a variable in a variable

[Masca]

Hi!  Please help!

 

I am sure there must be a simple way of doing what I want to do, but I can't find it!

 

I would like to hold a url in a variable.  The url contains another variable - e.g.:

 

$url = '/a_page_name/' . $ref . '/';

 

My problem is that $ref is declared (via a MySQL query) after $url is declared.  Is there a way of 'refreshing' $url once $ref has been declared, so that I only need to declare $url once in my header include file which is included at the beginning of all my pages?  I know that I could place it in a separate file which could be included after the MySQL query, but I would rather avoid that if possible.

 

I hope the above makes sense!  TIA.

[per1os]

The only thing that may work is $url a reference.

 

$url &= '/a_page_name/' . $ref . '/';

 

At least as far as my knowledge goes, but I have no clue if that would work or not given the static portion.

[Masca]

Thanks frost110, but sadly that doesn't seem to work.  If I echo $url after declaring $ref (e.g.: $ref = 1234;), the result is just '0'.

[sasa]

trx

<?php
$a = '$url = "/a_page_name/" . $ref . "/";';

$ref = 123;
eval($a);
echo $url, "<br />\n";
$ref = 'abcd';
eval($a);
echo $url, "<br />\n";
?>