“？”和GET方法之间的关系？

Question

I was wondering what might be the relation between the question mark, the variable after the question mark ('show' in this case) and the way it is being passed to the GET method in PHP. Also, why don't we use POST instead of GET?

<?php 

    if (isset($_GET['show'])
       echo $_GET['show'];

?>
<input type="submit" onClick="window.location='index.php?
show=include.inc.php'">

Oh, and the file I am working on is index.php and upon a click, it shows the content of include.inc.php.

Please help. Sorry for any stupid questions.

Answer 1

The question mark denotes that there is a variable to follow!

The way that the $_GET function works is by passing the variables through the URL itself! In this case, its like putting up a sign that says "Hey, show is equal to include.inc.php".

$_POST does the same, but more discreetly. Instead of passing it through the URL, it creates a little package that travels to the receiver, similar to the postal system.