Check if variable is empty?

[gamefreak13]

I have the below code which checks a text string (which is really a url) for certain occurances. However, I also need to make it check if the string is completely empty. This is being used to transform referer url's in to fancy labels, and if the referer is missing, I need it to say "Referer missing".

 

I know an if/else statement would work, but I'm not sure how to implement that in to a switch/case function... or if there is an easier way?

 

function my_parse($text){
$a = parse_url($text);
parse_str($a['query'],$b);
$b = array_change_key_case($b);
switch ($b['fuseaction']){
	case 'user.viewprofile':
		return 'Profile '.$b['friendid'];
		break;
	case 'bulletin.read':
		return 'Bulletin '.$b['messageid'];
		break;
	case 'mail.readmessage':
		return 'Message '.$b['messageid'];
		break;
	default:
		return 'Unknown Source';
}
print_r($b);
}

[smc]

Multiple options.

 

1) empty(); (Returns TRUE if it is empty, or FALSE if not)

 

2) if( $myVariable == "" ){} (Executes inner code if it is empty)

 

3) If you want to check if the variable is even set... isset( $myVariable ); (Returns TRUE if set, FALSE if not)

[gamefreak13]

Where would I insert that? Would it work if I put it between the second-to-last } and print_r?

 

if($test == "") {
return "Referer missing";
}

 

How does empty(); work? I would guess like so..

 

if(empty($test)) {
return "Referer missing";
}

[smc]

Either syntax will accomplish what you're looking for. Where to put it depends on in what order you want to check for it. Personally I don't do much with case-switches so however you would traditionally incorporate a boolean if statement.

[gamefreak13]

Does anyone else know how to implement it? I'm clueless.

 

I wonder if this would work? This would be in the file where the function is called.

 

if(empty($myvar)) {
echo "Referer missing";
} else {
return my_parse($myvar);
}