php使用一个boolean var修改表达式返回值

Question

This might sound naive, but in PHP, is it possible modify the outcome of an expression with one boolean value?

for example:

if(expression)
     //execute code

now, how can i do this?

if(!expression)
    //execute code

with the control of another boolean?

like:

$bool = true;
if( ($bool? :!)expression ) // if($bool) => !expresion ; if(!$bool) => expression 
    //execute code

so basically i want to have the have !expression when $bool is true and expression when $bool is false

i do know i can :

$bool ? !expression : expression

but it has the same expression twice...

Answer 1

if (expression == $bool)

or maybe

if (expression != $bool)