PHP Yii Framework Source Reading (ii) overall implementation process analysis

A procedure entrance

<?php
    
//change the following paths if necessary 
$yii =dirname (__file__). ' /http://www.cnblogs.com/framework/yii.php ';
$config =dirname (__file__). ' /protected/config/main.php ';
    
Remove the following line when in production mode
//defined (' Yii_debug ') or define (' Yii_debug ', true);
    
Require_once ($yii);
Yii::createwebapplication ($config)->run ();

The require_once ($YII) statement contains the yii.php file, which is a yii bootstrap file that contains the base class for Yiibase, and Yii fully inherits the Yiibase

<?php
/**
 * Yii bootstrap file.
 * *
 @author Qiang xue <qiang.xue@gmail.com>
 * @link http://www.yiiframework.com/
 * @copyright Copyright &copy; 2008-2011 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 * @version $Id: yii.php 2799 2011-01-01 19:31:13z Qiang.xue $
 * @package System
 * @since 1.0
    
/require (dirname). ' /yiibase.php ');
    
/**
 * Yii is a helper class serving common framework functionalities.
 *
 * * It encapsulates {@link Yiibase} which provides the actual implementation.
 * By writing your own Yii class, you can customize some functionalities of yiibase.
 *
 * @author Qiang xue <qiang.xue@gmail.com>
 * @version $Id: yii.php 2799 2011-01-01 19:31:13z qiang.xue $< c21/>* @package System
 * @since 1.0
 /
class Yii extends Yiibase
{
}

Some of the yiibase classes are defined as:

public static function Createwebapplication ($config =null)//Create startup public
    
static function import ($alias, $ Forceinclude=false)//class Import public
    
static function createcomponent ($config)//Create component public
    
static function Setapplication ($app)  //Create Instance of Class Yii::app ()

Two automatic loading mechanism

There are more important yii automatic loading mechanism, at the end of Yiibase referenced PHP standard library function Spl_autoload_register (array (' yiibase ', ' autoload ')) invoke the AutoLoad method in the frame

/** * Class autoload loader.
     * This are provided to be invoked within a __autoload () Magic method. * @param string $className class name * @return Boolean whether the class has been loaded successfully/PU Blic static function AutoLoad ($className) {//use include So, the error PHP file may appear if
        Set (self:: $classMap [$className])) include (self:: $classMap [$className]);
        else if (isset (self::$_coreclasses[$className)) include (yii_path.self::$_coreclasses[$className]);  else {//include class file relying on Include_path if (Strpos ($className, ' \ \ ') ===false)
                    Class without namespace {if (self:: $enableIncludePath ===false) { foreach (self::$_includepaths as $path) {$classFile = $path. Directory_separator. $className.
                        PHP '; if (iS_file ($classFile)) {include ($classFile);
                        Break else include ($className. ').
            php '); else//class name with namespace in PHP 5.3 {$namespace =str_replace (' \ \ ', '. ')
                , LTrim ($className, ' \ n ')); if ($path =self::getpathofalias ($namespace))!==false) include ($path. ').
                php ');
            else return false; Return Class_exists ($className, false) | |
        Interface_exists ($className, false);
    return true; }

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