Klein.php
klein.php is a fast & flexible router for PHP 5.3+
- Flexible regular expression routing (inspired by Sinatra)
- A set of boilerplate methods for rapidly building web apps
- Almost no overhead => 2500+ requests/second
Getting started
- PHP 5.3.x is required
- Install Klein using Composer (recommended) or manually
- Setup URL rewriting so that all requests are handled by index.php
- (Optional) Throw in some APC for good measure
Composer Installation
- Get Composer
- Require Klein with
php composer.phar require klein/klein - Add the following to your application’s main PHP file:
require 'vendor/autoload.php';
Example
Hello World - Obligatory hello world example
<?php
require_once __DIR__ . '/vendor/autoload.php';
$klein = new \Klein\Klein();
$klein->respond('GET', '/hello-world', function () {
return 'Hello World!';
});
$klein->dispatch();
Example 1 - Respond to all requests
$klein->respond(function () {
return 'All the things';
});
Example 2 - Named parameters
$klein->respond('/[:name]', function ($request) {
return 'Hello ' . $request->name;
});
Example 3 - So RESTful
$klein->respond('GET', '/posts', $callback);
$klein->respond('POST', '/posts', $callback);
$klein->respond('PUT', '/posts/[i:id]', $callback);
$klein->respond('DELETE', '/posts/[i:id]', $callback);
$klein->respond('OPTIONS', null, $callback);
// To match multiple request methods:
$klein->respond(array('POST','GET'), $route, $callback);
// Or you might want to handle the requests in the same place
$klein->respond('/posts/[create|edit:action]?/[i:id]?', function ($request, $response) {
switch ($request->action) {
//
}
});
Example 4 - Sending objects / files
$klein->respond(function ($request, $response, $service) {
$service->xml = function ($object) {
// Custom xml output function
}
$service->csv = function ($object) {
// Custom csv output function
}
});
$klein->respond('/report.[xml|csv|json:format]?', function ($request, $response, $service) {
// Get the format or fallback to JSON as the default
$send = $request->param('format', 'json');
$response->$send($report);
});
$klein->respond('/report/latest', function ($request, $response, $service) {
$response->file('/tmp/cached_report.zip');
});
Example 5 - All together
$klein->respond(function ($request, $response, $service, $app) use ($klein) {
// Handle exceptions => flash the message and redirect to the referrer
$klein->onError(function ($klein, $err_msg) {
$klein->service()->flash($err_msg);
$klein->service()->back();
});
// The fourth parameter can be used to share scope and global objects
$app->db = new PDO(...);
// $app also can store lazy services, e.g. if you don't want to
// instantiate a database connection on every response
$app->register('db', function() {
return new PDO(...);
});
});
$klein->respond('POST', '/users/[i:id]/edit', function ($request, $response, $service, $app) {
// Quickly validate input parameters
$service->validateParam('username', 'Please enter a valid username')->isLen(5, 64)->isChars('a-zA-Z0-9-');
$service->validateParam('password')->notNull();
$app->db->query(...); // etc.
// Add view properties and helper methods
$service->title = 'foo';
$service->escape = function ($str) {
return htmlentities($str); // Assign view helpers
};
$service->render('myview.phtml');
});
// myview.phtml:
<title><?php echo $this->escape($this->title) ?></title>
Route namespaces
$klein->with('/users', function () use ($klein) {
$klein->respond('GET', '/?', function ($request, $response) {
// Show all users
});
$klein->respond('GET', '/[:id]', function ($request, $response) {
// Show a single user
});
});
foreach(array('projects', 'posts') as $controller) {
// Include all routes defined in a file under a given namespace
$klein->with("/$controller", "controllers/$controller.php");
}
Included files are run in the scope of Klein ($klein) so all Klein methods/properties can be accessed with $this
Example file for: “controllers/projects.php”
// Routes to "/projects/?"
$this->respond('GET', '/?', function ($request, $response) {
// Show all projects
});
Lazy services
Services can be stored lazily, meaning that they are only instantiated on first use.
<?php
$klein->respond(function ($request, $response, $service, $app) {
$app->register('lazyDb', function() {
$db = new stdClass();
$db->name = 'foo';
return $db;
});
});
//Later
$klein->respond('GET', '/posts', function ($request, $response, $service, $app) {
// $db is initialised on first request
// all subsequent calls will use the same instance
return $app->lazyDb->name;
});
Validators
To add a custom validator use addValidator($method, $callback)
$service->addValidator('hex', function ($str) {
return preg_match('/^[0-9a-f]++$/i', $str);
});
You can validate parameters using is<$method>() or not<$method>(), e.g.
$service->validateParam('key')->isHex();
Or you can validate any string using the same flow..
$service->validate($username)->isLen(4,16);
Validation methods are chainable, and a custom exception message can be specified for if/when validation fails
$service->validateParam('key', 'The key was invalid')->isHex()->isLen(32);
Routing
[** match_type : param_name **]
Some examples
* // Match all request URIs
[i] // Match an integer
[i:id] // Match an integer as 'id'
[a:action] // Match alphanumeric characters as 'action'
[h:key] // Match hexadecimal characters as 'key'
[:action] // Match anything up to the next / or end of the URI as 'action'
[create|edit:action] // Match either 'create' or 'edit' as 'action'
[*] // Catch all (lazy)
[*:trailing] // Catch all as 'trailing' (lazy)
[**:trailing] // Catch all (possessive - will match the rest of the URI)
.[:format]? // Match an optional parameter 'format' - a / or . before the block is also optional
Some more complicated examples
/posts/[*:title][i:id] // Matches "/posts/this-is-a-title-123"
/output.[xml|json:format]? // Matches "/output", "output.xml", "output.json"
/[:controller]?/[:action]? // Matches the typical /controller/action format
Note - all routes that match the request URI are called - this allows you to incorporate complex conditional logic such as user authentication or view layouts. e.g. as a basic example, the following code will wrap other routes with a header and footer
$klein->respond('*', function ($request, $response, $service) { $service->render('header.phtml'); });
//other routes
$klein->respond('*', function ($request, $response, $service) { $service->render('footer.phtml'); });
Routes automatically match the entire request URI. If you need to match only a part of the request URI or use a custom regular expression, use the @ operator. If you need to negate a route, use the ! operator
// Match all requests that end with '.json' or '.csv'
$klein->respond('@\.(json|csv)$', ...
// Match all requests that _don't_ start with /admin
$klein->respond('!@^/admin/', ...
Views
You can send properties or helpers to the view by assigning them to the $service object, or by using the second arg of $service->render()
$service->escape = function ($str) {
return htmlentities($str);
};
$service->render('myview.phtml', array('title' => 'My View'));
// Or just: $service->title = 'My View';
myview.phtml
<title><?php echo $this->escape($this->title) ?></title>
Views are compiled and run in the scope of $service so all service methods can be accessed with $this
$this->render('partial.html') // Render partials
$this->sharedData()->get('myvar') // Access stored service variables
echo $this->query(array('page' => 2)) // Modify the current query string
API
Below is a list of the public methods in the common classes you will most likely use. For a more formal source of class/method documentation, please see the PHPdoc generated documentation.
$request->
id($hash = true) // Get a unique ID for the request
paramsGet() // Return the GET parameter collection
paramsPost() // Return the POST parameter collection
paramsNamed() // Return the named parameter collection
cookies() // Return the cookies collection
server() // Return the server collection
headers() // Return the headers collection
files() // Return the files collection
body() // Get the request body
params() // Return all parameters
params($mask = null) // Return all parameters that match the mask array - extract() friendly
param($key, $default = null) // Get a request parameter (get, post, named)
isSecure() // Was the request sent via HTTPS?
ip() // Get the request IP
userAgent() // Get the request user agent
uri() // Get the request URI
pathname() // Get the request pathname
method() // Get the request method
method($method) // Check if the request method is $method, i.e. method('post') => true
query($key, $value = null) // Get, add to, or modify the current query string
<param> // Get / Set (if assigned a value) a request parameter
$response->
protocolVersion($protocol_version = null) // Get the protocol version, or set it to the passed value
body($body = null) // Get the response body's content, or set it to the passed value
status() // Get the response's status object
headers() // Return the headers collection
cookies() // Return the cookies collection
code($code = null) // Return the HTTP response code, or set it to the passed value
prepend($content) // Prepend a string to the response body
append($content) // Append a string to the response body
isLocked() // Check if the response is locked
requireUnlocked() // Require that a response is unlocked
lock() // Lock the response from further modification
unlock() // Unlock the response
sendHeaders($override = false) // Send the HTTP response headers
sendCookies($override = false) // Send the HTTP response cookies
sendBody() // Send the response body's content
send() // Send the response and lock it
isSent() // Check if the response has been sent
chunk($str = null) // Enable response chunking (see the wiki)
header($key, $value = null) // Set a response header
cookie($key, $value = null, $expiry = null) // Set a cookie
cookie($key, null) // Remove a cookie
noCache() // Tell the browser not to cache the response
redirect($url, $code = 302) // Redirect to the specified URL
dump($obj) // Dump an object
file($path, $filename = null) // Send a file
json($object, $jsonp_prefix = null) // Send an object as JSON or JSONP by providing padding prefix
$service->
sharedData() // Return the shared data collection
startSession() // Start a session and return its ID
flash($msg, $type = 'info', $params = array() // Set a flash message
flashes($type = null) // Retrieve and clears all flashes of $type
markdown($str, $args, ...) // Return a string formatted with markdown
escape($str) // Escape a string
refresh() // Redirect to the current URL
back() // Redirect to the referer
query($key, $value = null) // Modify the current query string
query($arr)
layout($layout) // Set the view layout
yieldView() // Call inside the layout to render the view content
render($view, $data = array()) // Render a view or partial (in the scope of $response)
partial($view, $data = array()) // Render a partial without a layout (in the scope of $response)
addValidator($method, $callback) // Add a custom validator method
validate($string, $err = null) // Validate a string (with a custom error message)
validateParam($param, $err = null) // Validate a param
<callback>($arg1, ...) // Call a user-defined helper
<property> // Get a user-defined property
$app->
<callback>($arg1, ...) //Call a user-defined helper
$validator->
notNull() // The string must not be null
isLen($length) // The string must be the exact length
isLen($min, $max) // The string must be between $min and $max length (inclusive)
isInt() // Check for a valid integer
isFloat() // Check for a valid float/decimal
isEmail() // Check for a valid email
isUrl() // Check for a valid URL
isIp() // Check for a valid IP
isAlpha() // Check for a-z (case insensitive)
isAlnum() // Check for alphanumeric characters
contains($needle) // Check if the string contains $needle
isChars($chars) // Validate against a character list
isRegex($pattern, $modifiers = '') // Validate against a regular expression
notRegex($pattern, $modifiers ='')
is<Validator>() // Validate against a custom validator
not<Validator>() // The validator can't match
<Validator>() // Alias for is<Validator>()
Unit Testing
Unit tests are a crucial part of developing a routing engine such as Klein. Added features or bug-fixes can have adverse effects that are hard to find without a lot of testing, hence the importance of unit testing.
This project uses PHPUnit as its unit testing framework.
The tests all live in /tests and each test extends an abstract class AbstractKleinTest
To test the project, simply run php composer.phar install --dev to download a common version of PHPUnit with composer and run the tests from the main directory with ./vendor/bin/phpunit
Contributing
See the contributing guide for more info
More information
See the wiki for more information
Contributors
License
(MIT License)
Copyright (c) 2010 Chris O’Hara cohara87@gmail.com
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.