/usr/share/php/kohana3.1/system/guide/kohana/tutorials/library-kohana.md is in libkohana3.1-core-php 3.1.5-1.1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 | # Importing Kohana as a Library
If you're working with an existing codebase it's often difficult to modernise the code as it would mean a complete rewrite and there's rarely the time. An alternative is to improve the codebase incrementally as best you can, gradually outsourcing code to external libraries to reduce the amount of old code there is to maintain.
This tutorial describes how to include the Kohana PHP framework into existing PHP applications, without having to use the routing and HMVC request handling features.
[!!] The code modified in this tutorial was copied from Kohana version 3.1.x. You may need to update it to work with future releases.
In normal usage of the Kohana framework, the `index.php` file acts as the request handler; it sets up the environment, loads the system configuration, and then handles the request (see [Request Flow](flow)).
We'll walk you through the steps required to create a file we'll call `include.php` which will allow you to include Kohana from exiting PHP applications.
## Demo application
The following file will serve as our (insultingly simple) demo application for this tutorial.
### File: `demo.php`
~~~
<?php
$content = 'Hello World';
?>
<html>
<head>
<title>Demo page</title>
</head>
<body>
<?php echo $content; ?>
</body>
</html>
~~~
## Install Kohana
[Download and install the Kohana framework](install); from this point on, we'll be referring to the location of the Kohana libraries as the `kohana` directory.
## Create a common setup file
Since `index.php` and `include.php` will duplicate a lot of code, we're going to move that code to a third file, `common.php`. The bulk of the code is unchanged; we've changed the install check to exit rather than return after rendering, and removed the request execution.
The new file creates the initial request object, rather than fully executing the request, so that, if you do define routes, the `Request::$initial` variable will be set up correctly.
### File: `kohana/common.php`
~~~
<?php
/**
* The directory in which your application specific resources are located.
* The application directory must contain the bootstrap.php file.
*
* @link http://kohanaframework.org/guide/about.install#application
*/
$application = 'application';
/**
* The directory in which your modules are located.
*
* @link http://kohanaframework.org/guide/about.install#modules
*/
$modules = 'modules';
/**
* The directory in which the Kohana resources are located. The system
* directory must contain the classes/kohana.php file.
*
* @link http://kohanaframework.org/guide/about.install#system
*/
$system = 'system';
/**
* The default extension of resource files. If you change this, all resources
* must be renamed to use the new extension.
*
* @link http://kohanaframework.org/guide/about.install#ext
*/
define('EXT', '.php');
/**
* Set the PHP error reporting level. If you set this in php.ini, you remove this.
* @link http://www.php.net/manual/errorfunc.configuration#ini.error-reporting
*
* When developing your application, it is highly recommended to enable notices
* and strict warnings. Enable them by using: E_ALL | E_STRICT
*
* In a production environment, it is safe to ignore notices and strict warnings.
* Disable them by using: E_ALL ^ E_NOTICE
*
* When using a legacy application with PHP >= 5.3, it is recommended to disable
* deprecated notices. Disable with: E_ALL & ~E_DEPRECATED
*/
error_reporting(E_ALL | E_STRICT);
/**
* End of standard configuration! Changing any of the code below should only be
* attempted by those with a working knowledge of Kohana internals.
*
* @link http://kohanaframework.org/guide/using.configuration
*/
// Set the full path to the docroot
define('DOCROOT', realpath(dirname(__FILE__)).DIRECTORY_SEPARATOR);
// Make the application relative to the docroot, for symlink'd index.php
if ( ! is_dir($application) AND is_dir(DOCROOT.$application))
$application = DOCROOT.$application;
// Make the modules relative to the docroot, for symlink'd index.php
if ( ! is_dir($modules) AND is_dir(DOCROOT.$modules))
$modules = DOCROOT.$modules;
// Make the system relative to the docroot, for symlink'd index.php
if ( ! is_dir($system) AND is_dir(DOCROOT.$system))
$system = DOCROOT.$system;
// Define the absolute paths for configured directories
define('APPPATH', realpath($application).DIRECTORY_SEPARATOR);
define('MODPATH', realpath($modules).DIRECTORY_SEPARATOR);
define('SYSPATH', realpath($system).DIRECTORY_SEPARATOR);
// Clean up the configuration vars
unset($application, $modules, $system);
if (file_exists('install'.EXT))
{
// Load the installation check
include 'install'.EXT;
exit; // Changes were made here
}
/**
* Define the start time of the application, used for profiling.
*/
if ( ! defined('KOHANA_START_TIME'))
{
define('KOHANA_START_TIME', microtime(TRUE));
}
/**
* Define the memory usage at the start of the application, used for profiling.
*/
if ( ! defined('KOHANA_START_MEMORY'))
{
define('KOHANA_START_MEMORY', memory_get_usage());
}
// Bootstrap the application
require APPPATH.'bootstrap'.EXT;
/**
* Instantiate the request object. A source of the URI can be passed, eg: $_SERVER['PATH_INFO'].
* If no source is specified, the URI will be automatically detected.
*/
Request::factory(); // Changes were made here
~~~
## Alter Kohana's `index.php`
Having moved most of the code from Kohana's `index.php` to `common.php` the new `kohana/index.php` contains only this:
### File: `kohana/index.php`
~~~
<?php
require_once 'common.php';
// Execute the request
Request::$initial->execute()
->execute()
->send_headers(TRUE)
->body();
~~~
## Create the include file
Our `include.php` file is also pretty simple. The try-catch clause is needed because if the request matches no routes Kohana will throw an `HTTP_Exception_404` exception.
### File: `kohana/include.php`
~~~
<?php
try {
require_once 'common.php';
}
catch (HTTP_Exception_404 $e)
{
// The request did not match any routes; ignore the 404 exception.
}
~~~
**NB:** Due to the way Kohana's routing works, if the request matches no routes it will fail to instantiate an object, and `Request::$current` and `Request::$initial` will not be available.
## Integration
Now that we're set up, we can add Kohana into our application using a single include, and then we're good to go.
### File: `demo.php`
~~~
<?php
require_once 'kohana/include.php';
$content = 'Hello World';
$content = HTML::anchor('http://kohanaframework.org/', $content);
?>
<html>
<head>
<title>Demo page</title>
</head>
<body>
<?php echo $content; ?>
<hr />
<?php echo URL::base(); ?>
<hr />
<?php echo Debug::dump(array(1,2,3,4,5)); ?>
</body>
</html>
~~~
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