URL / GET help - preg_match, is_int???

[phpinfo()]

I have a page that shows information based on the user id. ex. http://www.domain.com/page?u=10

 

The problem is, if u=letters, I get a SQL error. - Instead I would like to make it to where if someone enters u=letters, it just exits to page.php. - Basically u can only = integers.

 

What would be the best way to do this?? -

 

I already have it so if u= a user non-existant, it exits. But that only works for invalid numbers:

 

$get = $_GET;


$uupid = ($get['u']) ? $get['u'] : 0;

if($uupid!=0)
{
$info1 = db_select("select user from accounts where user=$user");

if($uupid!=0 && $info1[0][0] == 0) { header("Location: page"); exit; }
}

 

[Caesar]

http://us2.php.net/is_integer

[phpinfo()]

http://us2.php.net/is_integer

 

How would I add this to the existing code? - Or what new codeset would I use with is_integer?

[Caesar]

Also...

 

http://us2.php.net/manual/en/function.is-numeric.php

 

Also...

 

<?php

if(!preg_match('/[0-9]+/',$uid)) {
  //// Do the dew, dude.
}

?>

[Caesar]

http://us2.php.net/is_integer

 

How would I add this to the existing code? - Or what new codeset would I use with is_integer?

 

<?php

if(!is_int($uid)) {
  //// Do the dew, dude.
}

?>

[phpinfo()]

Caesar, I have tried both methods and either continue to get the MySQL error if letters are entered for u= ; or I get a too many redirects browser error.

 

Again, I am just trying to figure out how to get the page to exit if letters are entered for page?u=

 

Any ideas / examples would be much appreciated.

 

Thanks!!!