Check if value is NOT in array

I'm trying to check if a certain value is NOT in an array.
Now I know I can check if a value is in an array with in_array...

but would something like this:

Language: PHP
if (!in_array(value, array)) {
    ...
}

work to check if the value is not in the array?

or could I do something like this:

Language: PHP
if (in_array(value, array) === false) {
    ...
}

What do you get when you try these approaches?

There is a function for this: in_array()

mac Wrote:
-------------------------------------------------------
> What do you get when you try these approaches?
>
> There is a function for this: in_array()

I'm not getting the results I want with my approach

I know the in_array function...but I want to call a function when the value is not found in the array.

I'm sure I can go this route (though not good practice I assume)
Or what would you guys suggest

Language: PHP
if (in_array(value, array) {
   do nothing
}
 
else {
    call function
}

Well, it is difficult to perceive what exactly you want to do so I suggest you play around until you find a solution! Good practice

In the end what I did was:

Language: PHP
$result = in_array(value, array);
 
if (result == 0) {
   function
}

even better, this works as well:

Language: PHP
if (!(in_array($cid, $oldCourse))) {
	email($courseID);
}