isset or not

[fizzwizz]

Hi
I've been doing some php studying and I'm a little confused about the isset() function. This apparantly returns the value TRUE if a variable is set

so I can do

if (isset($var)) echo "Var is set";

However, I'm confused because I have always used

if ($var) echo "Var is set";

What is the need of the isset function? What am I missing?

Thanks ... Fizz

[tommynanda]

isset() always returns a boolean value. Using $var alone may not return Boolean value when needed. It can return its own value.
Consider this code

<?
$var = FALSE;
$test = FALSE;
switch ($test)
{
	case isset($var):
	  echo "Yipee";
	  break;
	case FALSE:
	  echo "hehe";
	  break;
}

?>

Good Q 🙂

Good Luck
TommYNandA

[LordShryku]

Not using isset will give an error of E_NOTICE saying 'Undefined Variable'.

[fizzwizz]

I don't get that error, I assume this probably depends on my php setting! What setting could this be?

Thanks again ... Fizz

[tsinka]

Hi,

the error_reporting setting in php.ini controls which errors will be displayed. In your case I assume that it is set to something like E_ALL & ~E_NOTICE or something like that.

Thomas