从db中选择时，插入到mysql中的整数是不一样的

I have:

 $height = mysqli_real_escape_string($connect, $_POST['height'];

Which inserts an integer value to an INT database field.

When I select the same value back from the database I get a whole different number...

Is it real escape? Or is it a specific filter that i should use?

Thank you so much

EDIT

First of all, thank all of you who are being a real help!!!

Here is my code:

I have a sql field called height INT(3)

the form input is as such:

the query is:

$sql = mysqli_query($connect, "INSERT INTO patient (height) VALUES ('$height')");

the code triggering this query is:

if (isset($_POST['dossier'])) {
    $height = mysqli_real_escape_string($connect, $_POST['height']);
}

Now, lets say I post 4, then I echo the $height variable I get 5...

First time I get this error...

Thank you so much!!

LAST EDIT

I found the problem!!!

I had a mathematical calculation where I used a wrong operator:

if ($row['gender'] === "m") {
                if ($height = 5) { // <------ RIGHT HERE!!!!!
                    $height_measure = 106 + ($height_dec * 6);
}

So I changed the operator to === and now everything works fine again!!!!

Thanks for those who tried to help! And those who voted negative, you could have been more of a help and at least direct me to a replicated question or something!!! :) You know, constructive criticism!!!!

Thank you again all!

Because your height is always integer value I think it's better to use:

$height = (int) $_POST['height'];

I had a mathematical calculation where I used a wrong operator:

if ($row['gender'] === "m") {
                if ($height = 5) { // <------ RIGHT HERE!!!!!
                    $height_measure = 106 + ($height_dec * 6);
}

So I changed the operator to === and now everything works fine again!!!!