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How to implement URL Routing in PHP.
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In its most common configuration, PHP relies on the web server to do the routing. This is done by mapping the request path to a file: If you request www.example.org/test.php, the web server will actually look for a file named test. php in a pre-defined directory.
The Router attempts to match the first one, or two, parts of the path component to a corresponding route combination ( Controller / Action [method], or just a Controller that executes a default action (method). An action, or command, is simply a method off of a specific Controller .
Symfony provides a Routing component which allows us, for a HTTP request/URL, to execute a specific function (also known as "Controller"). Note: Controllers must be a callable, for example: an anonymous function: $controller = function (Request $request) { return new Response() }; .
If you use Apache you can do the URL routing via mod_rewrite.
Small example:
RewriteEngine On
RewriteRule ^(dir1)/?(path2)? main.php?dir=$1&path=$2
That'll have any request like
http://yoursite.com/dir1/path1
served by
http://yoursite.com/main.php?dir=dir1&path=path2
More examples here.
The other alternative have every request redirect to a single php file
RewriteEngine On
RewriteRule (.*) main.php?request=$1
and then to do it in code, where you can use a similar approach, by having a set of regular expressions that are matched by some code and then redirected via header() or just internally.
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First of all, you will need Apache's (I suppose your webserver is Apache) mod_rewrite to be enabled.
Then, you need to create a RewriteRule to redirect everything to your index.php page.
Something like this could do :
RewriteEngine on
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule .* index.php
It will redirect every request to a file that doesn't exist to index.php ; this means that, if the requested URL is www.example.com/blah, it is actually index.php that will be called.
About that, here a couple of link that can help :
Then, this page has to determine what has to be displayed, depending on what initial URL was called -- or what parameters are received.
This can be done using the Design Pattern Front Controller, for instance -- it's implemented in most modern PHP Frameworks, for instance.
There have been many questions of this subject on SO ; some of those (and their answers) might probably help you. For instance :
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