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Informations about the package router

bramus/router

Build Status Source Version Downloads License

A lightweight and simple object oriented PHP Router. Built by Bram(us) Van Damme (https://www.bram.us) and Contributors

Features

Prerequisites/Requirements

Installation

Installation is possible using Composer

Demo

A demo is included in the demo subfolder. Serve it using your favorite web server, or using PHP 5.4+'s built-in server by executing php -S localhost:8080 on the shell. A .htaccess for use with Apache is included.

Additionally a demo of a mutilingual router is also included. This can be found in the demo-multilang subfolder and can be ran in the same manner as the normal demo.

Usage

Create an instance of \Bramus\Router\Router, define some routes onto it, and run it.

Routing

Hook routes (a combination of one or more HTTP methods and a pattern) using $router->match(method(s), pattern, function):

bramus/router supports GET, POST, PUT, PATCH, DELETE, HEAD (see note), and OPTIONS HTTP request methods. Pass in a single request method, or multiple request methods separated by |.

When a route matches against the current URL (e.g. $_SERVER['REQUEST_URI']), the attached route handling function will be executed. The route handling function must be a callable. Only the first route matched will be handled. When no matching route is found, a 404 handler will be executed.

Routing Shorthands

Shorthands for single request methods are provided:

You can use this shorthand for a route that can be accessed using any method:

Note: Routes must be hooked before $router->run(); is being called.

Note: There is no shorthand for match() as bramus/router will internally re-route such requrests to their equivalent GET request, in order to comply with RFC2616 (see note).

Route Patterns

Route Patterns can be static or dynamic:

Static Route Patterns

A static route pattern is a regular string representing a URI. It will be compared directly against the path part of the current URL.

Examples:

Usage Examples:

Dynamic PCRE-based Route Patterns

This type of Route Patterns contain dynamic parts which can vary per request. The varying parts are named subpatterns and are defined using regular expressions.

Examples:

Commonly used PCRE-based subpatterns within Dynamic Route Patterns are:

Note: The PHP PCRE Cheat Sheet might come in handy.

The subpatterns defined in Dynamic PCRE-based Route Patterns are converted to parameters which are passed into the route handling function. Prerequisite is that these subpatterns need to be defined as parenthesized subpatterns, which means that they should be wrapped between parens:

Note: The leading / at the very beginning of a route pattern is not mandatory, but is recommended.

When multiple subpatterns are defined, the resulting route handling parameters are passed into the route handling function in the order they are defined in:

Dynamic Placeholder-based Route Patterns

This type of Route Patterns are the same as Dynamic PCRE-based Route Patterns, but with one difference: they don't use regexes to do the pattern matching but they use the more easy placeholders instead. Placeholders are strings surrounded by curly braces, e.g. {name}. You don't need to add parens around placeholders.

Examples:

Placeholders are easier to use than PRCEs, but offer you less control as they internally get translated to a PRCE that matches any character (.*).

Note: the name of the placeholder does not need to match with the name of the parameter that is passed into the route handling function:

Optional Route Subpatterns

Route subpatterns can be made optional by making the subpatterns optional by adding a ? after them. Think of blog URLs in the form of /blog(/year)(/month)(/day)(/slug):

The code snippet above responds to the URLs /blog, /blog/year, /blog/year/month, /blog/year/month/day, and /blog/year/month/day/slug.

Note: With optional parameters it is important that the leading / of the subpatterns is put inside the subpattern itself. Don't forget to set default values for the optional parameters.

The code snipped above unfortunately also responds to URLs like /blog/foo and states that the overview needs to be shown - which is incorrect. Optional subpatterns can be made successive by extending the parenthesized subpatterns so that they contain the other optional subpatterns: The pattern should resemble /blog(/year(/month(/day(/slug)))) instead of the previous /blog(/year)(/month)(/day)(/slug):

Note: It is highly recommended to always define successive optional parameters.

To make things complete use quantifiers to require the correct amount of numbers in the URL:

Subrouting / Mounting Routes

Use $router->mount($baseroute, $fn) to mount a collection of routes onto a subroute pattern. The subroute pattern is prefixed onto all following routes defined in the scope. e.g. Mounting a callback $fn onto /movies will prefix /movies onto all following routes.

Nesting of subroutes is possible, just define a second $router->mount() in the callable that's already contained within a preceding $router->mount().

Class@Method calls

We can route to the class action like so:

When a request matches the specified route URI, the showProfile method on the User class will be executed. The defined route parameters will be passed to the class method.

The method can be static (recommended) or non-static (not-recommended). In case of a non-static method, a new instance of the class will be created.

If most/all of your handling classes are in one and the same namespace, you can set the default namespace to use on your router instance via setNamespace()

Custom 404

The default 404 handler sets a 404 status code and exits. You can override this default 404 handler by using $router->set404(callable);

You can also define multiple custom routes e.x. you want to define an /api route, you can print a custom 404 page:

Also supported are Class@Method callables:

The 404 handler will be executed when no route pattern was matched to the current URL.

💡 You can also manually trigger the 404 handler by calling $router->trigger404()

Before Route Middlewares

bramus/router supports Before Route Middlewares, which are executed before the route handling is processed.

Like route handling functions, you hook a handling function to a combination of one or more HTTP request methods and a specific route pattern.

Unlike route handling functions, more than one before route middleware is executed when more than one route match is found.

Before Router Middlewares

Before route middlewares are route specific. Using a general route pattern (viz. all URLs), they can become Before Router Middlewares (in other projects sometimes referred to as before app middlewares) which are always executed, no matter what the requested URL is.

After Router Middleware / Run Callback

Run one (1) middleware function, name the After Router Middleware (in other projects sometimes referred to as after app middlewares) after the routing was processed. Just pass it along the $router->run() function. The run callback is route independent.

Note: If the route handling function has exit()ed the run callback won't be run.

Overriding the request method

Use X-HTTP-Method-Override to override the HTTP Request Method. Only works when the original Request Method is POST. Allowed values for X-HTTP-Method-Override are PUT, DELETE, or PATCH.

Subfolder support

Out-of-the box bramus/router will run in any (sub)folder you place it into … no adjustments to your code are needed. You can freely move your entry script index.php around, and the router will automatically adapt itself to work relatively from the current folder's path by mounting all routes onto that basePath.

Say you have a server hosting the domain www.example.org using public_html/ as its document root, with this little entry script index.php:

Disabling subfolder support

In case you don't want bramus/router to automatically adapt itself to the folder its being placed in, it's possible to manually override the basePath by calling setBasePath(). This is necessary in the (uncommon) situation where your entry script and your entry URLs are not tightly coupled (e.g. when the entry script is placed into a subfolder that does not need be part of the URLs it responds to).

If you were to place this file into a subfolder (e.g. public_html/some/sub/folder/index.php), it will still mount the routes onto the domain root (e.g. /) and thus respond to https://www.example.org/ and https://www.example.org/hello (given that your .htaccess file – placed at the document root level – rewrites requests to it)

Integration with other libraries

Integrate other libraries with bramus/router by making good use of the use keyword to pass dependencies into the handling functions.

Given this structure it is still possible to manipulate the output from within the After Router Middleware

A note on working with PUT

There's no such thing as $_PUT in PHP. One must fake it:

A note on making HEAD requests

When making HEAD requests all output will be buffered to prevent any content trickling into the response body, as defined in RFC2616 (Hypertext Transfer Protocol -- HTTP/1.1):

The HEAD method is identical to GET except that the server MUST NOT return a message-body in the response. The metainformation contained in the HTTP headers in response to a HEAD request SHOULD be identical to the information sent in response to a GET request. This method can be used for obtaining metainformation about the entity implied by the request without transferring the entity-body itself. This method is often used for testing hypertext links for validity, accessibility, and recent modification.

To achieve this, bramus/router but will internally re-route HEAD requests to their equivalent GET request and automatically suppress all output.

Unit Testing & Code Coverage

bramus/router ships with unit tests using PHPUnit.

Acknowledgements

bramus/router is inspired upon Klein, Ham, and JREAM/route . Whilst Klein provides lots of features it is not object oriented. Whilst Ham is Object Oriented, it's bad at separation of concerns as it also provides templating within the routing class. Whilst JREAM/route is a good starting point it is limited in what it does (only GET routes for example).

License

bramus/router is released under the MIT public license. See the enclosed LICENSE for details.


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