I see a lot of scripts that have links that has question marks in them and i would like to know what the question marks means. Thanks!!!

Example

<a href=books.php?username=blank>blank</a>

I am not sure what the question mark means, but in the above case, there will be GET variables in the URL which can be referenced by the books.php script like so:

PHP Code:

$var = $_GET['username'];
echo $var;// this will give the string "blank" 


There are other cases in PHP where the question mark means something. It's like a short hand way of setting a variable based on a boolean expression.

http://www.wellho.net/mouth/1825_Que...-and-PHP-.html

The "?" question mark in this case has nothing to do with PHP at all. This is a format that the URL uses to seperate the URI path and defined parameters. The amperstand "&" is used to delimit each defined parameter key. The hash "#" is used at the end of an URL to assign the anchor point of the landing page.


http://www.domain.com/path/page.html?parameter1=value1&parameter2=value2#anchor

Color Key:
protocol
sub-domain
domain
path
file
parameter
value
anchor

it tells the parameters passing start in url

Thanks guys that's what i was looking for.