if子句添加空

i have the following if-clause:

if(empty($var)){
                $errors[]="Failure";
            }

this is for a form that will be display an errormessage when a user has made no entries. i would like to hide this field when a user has made something specific so that he cant see this input field. this div will only being displayed when another variable is set. because of the "empty" problem i got the errormessage even when there is no inputfield. so my question is:

how can i add further terms to that clause that it will be like:

if(empty($var) only when $var2===true ){
    $errors[]="Failure";
            }

i already tried to use && but this doesn't work the correct way. thats why i'm asking and thought maybe there is another way. thanks to all.

Try:

if(empty($var) AND $var2) {
    $errors[]="Failure";
}

If $var is empty and $var2 is TRUE it will be inside the if condition. did you mean something like that

Probably $var2 is 1 and not true, because in other case this need to work

if(empty($var) && $var2===true){
    $errors[]="Failure";
}

Try

if(empty($var) && $var2==true){
    $errors[]="Failure";
}

== instead of === or check for logical bugs.