false variable

Anon

i'm trying to make a form that takes a users input and runs it through a javascript for output. that is working fine, where i am getting hung up is setting the script to contain a default output before the user has put in anything.

I'm familiar with other languages, i just can't find the correct syntax to check whether a variable contains a value, and if not assign it one

if !$query {
$query=default;
echo $query; //obviously echos "default"
} else {
echo $query;
then run some stuff;
}//end if

but it's that !$query thing i'm getting stuck on

alfbennett

Try Just checking to see if it is equal to an empty string

if($query==""){
$query="default";
echo $query;
}else{
echo $query;
}

I think that one is prety much foolproof, but you could also try.

if(!isset($query)){
$query="default";
echo $query;
}else{
echo $query;
}

Hope that's Helpful

Anon

if(!$query){
$query="default";
echo $query;
}else{
echo $query;
}

if(!$query)
checks if it does not exsist
and

if($query)
checks if it does exsists