Uninitialized Variables

[Anon]

Can PHP deal with variables that are not initialized? It is kicking out an
error when it runs into something that is not defined yet.

mysql_select_db("mydb",$db);

if ($id) { <=========Not initialized and PHP
kicks an error?

// query the DB

Thanks!
Dwight

[dgrinberg]

Yes PHP can deal with unitialized variables, well in a sense anyway. You have to capture them.

There is a function called isset(var) wher var is your variable. It returns true if initialized of flase if not. There is much more info on it in the manual so you should look there to get a good idea of what it does.

basically as your code goes

if isset ($id){

//query the db
}
else{
//provide an erro message.
}

It is a good piece of code to ensure that query string variables have been correctly assigned.

David

[Anon]

Awesome... That is what I was missing. Thanks for the help!

Dwight

[Anon]

Another thing to bear in mind is that this isn't actually an error, it's a warning(i think), which you can turn off in your php config file.

Arta.