Question

I am using same php page for different operation. So condition wise I am doing some actions

Which one showing good perfomance?

This one
    if($catid){ .. some action }

    if($sub_catid){ .. some action }

    if($sub_sub_catid){ .. some action }

OR This one

    if($catid){ 
        .. some action 
    }else{    
        if($sub_catid){ 
            .. some action 
        }else{    
            if($sub_sub_catid){
                .. some action
            }
        }
    }

Answer 1

First off, those two have very different meanings. The first one could allow every single statement to execute if all those variables were TRUE. The second one will “short-circuit” the first time it finds something TRUE.

What I think you’re looking for is:

if($catid) { 
    .. some action 
} else if($sub_catid) { 
    .. some action 
} else if($sub_sub_catid) {
    .. some action
}

Bonus points: more readable!