How does PHP interpret Javascript's Null value?

Question

Sol let's suppose that we send a post query to a PHP file, this query where we have ...&title=title where title is for example title=$(#title).val(); (assuming we're including Jquery) in PHP we have $title=$_POST['title']; Let's suppose then that title is null , will PHP consider null as string ? or something empty ?

Answer 1

From the PHP Manual:

The special NULL value represents a variable with no value. NULL is the only possible value of type NULL.

A variable is considered to be NULL if:

• it has been assigned the constant NULL.
• it has not been set to any value yet.
• it has been unset().

"NULL" is not the same as NULL.

var_dump("null" == NULL);

Outputs:

bool(false)

Answer 2

The title gets converted to a string before sending it to the server.

Converting the JS value null to a string results in a string "null". Therefore, PHP will only interpret the variable as a string.

However, I doubt that you will receive a null value from an empty input box. You will get an empty string instead.