How to get the previous url using PHP
PhpHttpUrlReferrerPhp Problem Overview
Suppose my site's url is given as hyperlink on some page on the internet; that page could be anything on internet - blog, orkut, yahoo, even stackoverflow etc, and someone clicks on it,and visited my site. So can we know, using php, the previous url from which the visitor came to my page?
Php Solutions
Solution 1 - Php
Use the $_SERVER['HTTP_REFERER'] header, but bear in mind anybody can spoof it at anytime regardless of whether they clicked on a link.
Solution 2 - Php
$_SERVER['HTTP_REFERER'] is the answer
Solution 3 - Php
$_SERVER['HTTP_REFERER'] will give you incomplete url.
If you want http://bawse.3owl.com/jayz__magna_carta_holy_grail.php, $_SERVER['HTTP_REFERER'] will give you http://bawse.3owl.com/ only.
Solution 4 - Php
I can't add a comment yet, so I wanted to share that HTTP_REFERER is not always sent.
https://stackoverflow.com/questions/19976189/notice-undefined-index-http-referer
Solution 5 - Php
But you could make an own link for every from url.
Example: http://example.com?auth=holasite
In this example your site is: example.com
If somebody open that link it's give you the holasite value for the auth variable.
Then just $_GET['auth'] and you have the variable. But you should have a database to store it, and to authorize.
Like: $holasite = http://holasite.com (You could use mysql too..)
And just match it, and you have the url.
This method is a little bit more complicated, but it works. This method is good for a referral system authentication. But where is the site name, you should write an id, and works with that id.
Solution 6 - Php
Basically we are using the $_SERVER['HTTP_REFERER'] for getting the previous url for our site but it is waste of time it gives you the half url. So, the best way to get previous URL is Javascript and Jquery.