How exactly would I get the URL with PHP so I could do this:
profile.php?username=Blah
How would I get the 'Blah' from the username= part by using PHP?
In PHP there are global variables that hold parameters passed on the url or by posting a form. Some of this variables are $_GET, $_POST, $_REQUEST, $_FILES.
<?php
$username = $_GET['username']
echo $username;
You can read more on superglobal variables here: http://www.php.net/manual/en/language.variables.superglobals.php
Use the $_GET variable
$username = $_GET['username'];
The special $_GET[docs] variable is an array containing all parameters passed in the URL, like username in your example.
You can access them using the $_GET['parameter_name'] syntax:
$username = $_GET['username'];
See the manual page of this variable: http://docs.php.net/manual/en/reserved.variables.get.php
You can use $_GET['username'] to retrieve the username parameter value from the URL For more on this visit: http://www.w3schools.com/php/php_get.asp