comapre zero with unassigned variable

[abdfahim]

Hi,

 

A quick help needed. I have the following code

 

if($var==0){
return $var;
}

 

Here, if $var is assigned to zero or $var is not assigned, both cases returns true. I want only to return true when $var is assigned to zero, false otherwise. I dont want to use empty or isset function.

 

Thanks,

[DavidAM]

Equivalence operator (3 equals signs) means the value is the same and the data type is the same.  An empty string or unassigned variable does not have the same data type as a numeric zero.

 

if($var===0){
return $var;
}

[abdfahim]

I am not sure about that. The reason is, if I have an array consisting both numbers and texts, and then I want to compare one  array element with zero using Equivalence operator, it might not match, ryt?