[SOLVED] why does empty() not work on object ?

[anatak]

hello

 

$error= $db->ErrorMsg();

if(empty($error)){echo 'empty';}

 

works fine

 

if(empty($db->ErrorMsg())){echo 'empty';}

 

does not work.

Can someone explain why ?

 

related to empty() I also have this non OOP question

if(!isset($var)){echo 'var is not set';}

works but

if(!empty($var)){echo 'var is not set';}

does not work

 

Is there a reason why you can not test for !empty() ??

 

kind regards

anatak

 

thank you

 

[emehrkay]

check the changelog http://us2.php.net/empty

 

your second question says two different things

-if it isnt set...

-if it is not empty...

[per1os]

On that note, why not create a function in the class that checks the errormsg variable for you something like:

 

<?php

if (!$db->errorEmpty()) {

}



// (note this should be in the class with the right values
function errorEmpty() {
   if (!empty($this->error)) {
          return true;
   }

   return false;
}
?>

 

Should work just the same as you intended it, just a little bit less code and less chance for error as you do not have to add !empty() to ever if statement like this it is simply if !$db->errorEmpty()  =)

[anatak]

sorry for the long wait.

 

About the empty() function.

 

I just wondered why !empty($var) does not work.

 

if(empty($var)){echo $var .'is empty';} //this works

if(!empty($var)){echo $var .'is not empty';} //this does not works

 

anyway I can work around it so it is not much of a problem.

Thanks for the help with understanding $db->ErrorMsg();

 

 

[Jenk]

You haven't defined $var. Read people's replies carefully, this was answered in the first reply.

[anatak]

Jenk,

 

I think that empty($var) checks to see if $var exist (not defined), if $var=null or if $var="" (empty string)

if the $var is in any of these conditions the empty() function will return true

I was just wondering why !empty() in an if statement did not seem to work.

 

anyway my problem is solved so I will close this topic

anatak

[Jenk]

You still didn't read the first reply properly.

 

empty($var) will return true if either $var is undefined, or contains the value of null, 0, "" (empty string) or an empty array.

 

I suggest you read that line very carefully, then read it again carefully, and once more for luck, before replying again.