PHP How to build a dynamic URL and then goto Location? -

First of all, I do not quite understand the location function in PHP, because if I take it a if ( Isset) or one if ($ _GET) statement is inside the second and mainly, I'm interested in creating a dynamic URL

This idea is when a user clicks on an href, So it adds $ PRODUCT variable to the first $ url, and then executes the href, displays the new page

me Although there is a problem using the href, as I think it actually executes before the $ _GET function, and therefore not loading in the variable before performing my $ url.

I've partially done this, but when I click on another href, it seems to add the url to value = ASC .

   Product & lt; / A & gt; & Lt; / Li & gt; & Lt; Li & gt; & Lt; A href = "& lt ;? php echo". $ Url. '' $ GETProduct. 'Value = ASC' ;? & gt; " Name = "value" id = "value" style = "color: # 000;" /> All prices & lt; / A & gt; & Lt; / Li & gt; & Lt; / Ul & gt; & Lt ;? Php echo $ url; Echo '###########'; Copy $ GETProduct; Echo '###########'; Echo $ GETPrice; ? & Gt; & Lt; / Html & gt;  

URL for PHP When inserting the variable

www.myurl.com/filename.php?object=myVar&object=myVar

Take notice of the above snippet in Epherfeld and Add it to your code.