[RESOLVED] Confused - testing for no variable passed

[infected_toe]

Hi All,

I'm new here but have been playing around with PHP for a bit. This should be an easy question for somebody.

www.mysite.com/varX

// do this stuff at the top of every page

if (isset($var1))
[INDENT]{
// do this stuff
}[/INDENT]

if (isset($var2))
[INDENT]{
// do this stuff
}[/INDENT]

<PROBLEM>
// do this stuff if varX isn't passed (i.e. address = www.mysite.com)
// I plan to put a welcome to the site paragraph here.
// But, I don't want it to show if a varX is set.
</PROBLEM>

// do this stuff at the bottom of every page

= = = = = = = = = = = = = = =

I've looked into is_null and is_empty, but couldn't get it to work. On a previous version of PHP I used this: if (is_null).

Any suggestions or points in the right direction?

[NogDog]

If you want to do something if a variable has been set with any value:

if(isset($variable))
{
  // do something
}

If you want to do something only if a variable is set with a value other than 0 (integer or float zero), "0" (string 0), "" (empty string), boolean FALSE, or NULL, then:

if(!empty($variable))
{
   // do something
}

If you want to do something if a variable is set with any value other than NULL:

if(isset($variable) and $variable !== NULL) // note use of !== instead of !=
{
   // do something
}

[infected_toe]

Thanks for the reply. What I am looking for is a way to display certain data ONLY if there is no passed variable in the address.

I can test for this: www.mysite.com?var1

[INDENT]// show some stuff here

[INDENT]if (isset($var1))
   {
   do this
   }[/INDENT]

[INDENT]if (isset($var2))
   {
   do this
   }[/INDENT]

// show some more stuff here[/INDENT]

What I can't test for is this: www.mysite.com

[INDENT]// show some stuff here

[INDENT]if (isset($var1))
   {
   do this
   }[/INDENT]

[INDENT]if (isset($var2))
   {
   do this
   }[/INDENT]

[INDENT]if (is_null)  // only show this data if there is no ?var in the address; syntax?
   {
   let's say I want a menu here only if at the top of site, not if a ?var is in address line
   }[/INDENT]

// show some more stuff here[/INDENT]

[NogDog]

I would think either of these would do the job:

if(count($_GET) == 0)
{
   // nothing received in URL query string
}

// ... or ...
if(empty($_SERVER['QUERY_STRING']))
{
   // no query string received in URL
}

[infected_toe]

<thanks>
[INDENT]<exactly what i was looking for>

[INDENT]if(empty($_SERVER['QUERY_STRING'])) [/INDENT]

</exactly what i was looking for>[/INDENT]
</thanks>

[bradgrafelman]

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