What exactly does the PHP function “test_input()” do?

Question

I know I will be voted down for this, but I need to ask. What does the code below mean? Specifically, I am confused by

if (empty($_POST[\"comment\"])) { $comme         


        

Answer 1

There is no any such PHP function like test_input().

It might be the user defined function in w3schools website. Just go on the website you mentioned and run the example code and in tryit editor check the source code once, you may get that function there.

Some times websites dont display all the functions while giving the explanation, so just refer the source code