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上一篇主要分析了Yii::createWebApplication ( $config )->run ();的createWebApplication ( $config )部分，這篇分析後面的。
run()也是不在CWebApplication裡面，在CApplication 裡。
1 <?php
2 abstract class CApplication extends CModule {
3 private $_id;
4 private $_basePath;
5 abstract public function processRequest();
6 public function __construct($config = null) {
7 if (is_string ( $config ))
8 $config = require ($config);
9 Yii::setApplication ( $this );//保存整個app實例
10 if (isset ( $config ['basePath'] )) {
11 $this->setBasePath ( $config ['basePath'] );
12 unset ( $config ['basePath'] );
13 } else
14 $this->setBasePath ( 'protected' );
15 //設置別名,後面就可以用application表示basePath了
16 Yii::setPathOfAlias ( 'application', $this->getBasePath () );
17 //鉤子，模塊 預 初始化時執行，子類實現。不過這時，配置還沒有寫入框架
18 $this->preinit ();
19 $this->registerCoreComponents ();
20 //父類實現
21 $this->configure ( $config );
22 //加載靜態應用組件
23 $this->preloadComponents ();
24 //這才開始初始化模塊
25 $this->init ();
26 }
27 protected function registerCoreComponents() {
28 $components = array (
29 'request' => array (
30 'class' => 'CHttpRequest'
31 ),
32 'urlManager' => array (
33 'class' => 'CUrlManager'
34 )
35 );
36
37 $this->setComponents ( $components );//父類實現
38 }
39 public function run() {
40 $this->processRequest ();
41 }
42 public function getId() {
43 if ($this->_id !== null)
44 return $this->_id;
45 else
46 return $this->_id = sprintf ( '%x', crc32 ( $this->getBasePath () . $this->name ) );
47 }
48 public function setId($id) {
49 $this->_id = $id;
50 }
51 public function getBasePath() {
52 return $this->_basePath;
53 }
54 public function setBasePath($path) {
55 if (($this->_basePath = realpath ( $path )) === false || ! is_dir ( $this->_basePath ))
56 return;
57 }
58 public function getDb() {
59 return $this->getComponent ( 'db' );//父類實現
60 }
61 public function getUrlManager() {
62 return $this->getComponent ( 'urlManager' );
63 }
64 public function getController() {
65 return null;
66 }
67 public function getBaseUrl($absolute = false) {
68 return $this->getRequest ()->getBaseUrl ( $absolute );
69 }
70 }
run()又用了CWebApplication裡面的processRequest()。薛強大哥（yii作者），架構要不要這樣啊.裁剪後當然覺得這樣的調用很沒意思。
後面的主要在CWebApplication裡了。
1 <?php
2 class CWebApplication extends CApplication {
3 public $controllerNamespace;
4 private $_controllerPath;
5 private $_viewPath;
6 private $_systemViewPath;
7 private $_controller;
8 public $controllerMap=array();
9 public function processRequest() {//開始執行請求
10 //獲取urlManager組件，解析請求，得到controller/action這種格式的string,
11 //並且將隱藏參數與請求的參數一一對應，匹配起來，寫入$_REQUEST中
12 $route = $this->getUrlManager ()->parseUrl ($this->getRequest());
13 $this->runController ( $route );
14 }
15 public function getRequest() {//獲取request組件
16 return $this->getComponent ( 'request' );
17 }
18 protected function registerCoreComponents() {//注冊核心組件
19 parent::registerCoreComponents ();
20 }
21 //執行contronller
22 public function runController($route) {
23 if (($ca = $this->createController ( $route )) !== null) {
24 list ( $controller, $actionID ) = $ca;
25 $oldController = $this->_controller;
26 $this->_controller = $controller;
27 $controller->init ();//鉤子,在執行action方法前調用，子類去實現
28 $controller->run ( $actionID );//開始轉入controller類中action方法的執行
29 $this->_controller = $oldController;
30 }
31 }
32 //創建controller類實例,從controller/action這種格式的string中解析出$controller, $actionID
33 public function createController($route, $owner = null) {
34 if ($owner === null)
35 $owner = $this;
36 if (($route = trim ( $route, '/' )) === '')
37 $route = $owner->defaultController;
38
39 $route .= '/';
40 while ( ($pos = strpos ( $route, '/' )) !== false ) {
41 $id = substr ( $route, 0, $pos );
42 if (! preg_match ( '/^\w+$/', $id ))
43 return null;
44 $id = strtolower ( $id );
45 $route = ( string ) substr ( $route, $pos + 1 );
46 if (! isset ( $basePath )) // first segment
47 {
48 $basePath = $owner->getControllerPath ();
49 $controllerID = '';
50 } else {
51 $controllerID .= '/';
52 }
53 $className = ucfirst ( $id ) . 'Controller';
54 $classFile = $basePath . DIRECTORY_SEPARATOR . $className . '.php';
55
56 if (is_file ( $classFile )) {
57 if (! class_exists ( $className, false ))
58 require ($classFile);
59 if (class_exists ( $className, false ) && is_subclass_of ( $className, 'CController' )) {
60 $id [0] = strtolower ( $id [0] );
61 return array (
62 new $className ( $controllerID . $id, $owner === $this ? null : $owner ),
63 $this->parseActionParams ( $route )
64 );
65 }
66 return null;
67 }
68 $controllerID .= $id;
69 $basePath .= DIRECTORY_SEPARATOR . $id;
70 }
71 }
72 protected function parseActionParams($pathInfo) {
73 if (($pos = strpos ( $pathInfo, '/' )) !== false) {
74 $manager = $this->getUrlManager ();//再次獲取urlManager,在上面第一次調用中已經導入。
75 $manager->parsePathInfo ( ( string ) substr ( $pathInfo, $pos + 1 ) );
76 $actionID = substr ( $pathInfo, 0, $pos );
77 return $manager->caseSensitive ? $actionID : strtolower ( $actionID );
78 } else
79 return $pathInfo;
80 }
81 public function getControllerPath() {
82 if ($this->_controllerPath !== null)
83 return $this->_controllerPath;
84 else
85 return $this->_controllerPath = $this->getBasePath () . DIRECTORY_SEPARATOR . 'controllers';
86 }
87 //兩個鉤子,子類去實現
88 public function beforeControllerAction($controller, $action) {
89 return true;
90 }
91 public function afterControllerAction($controller, $action) {
92 }
93 protected function init() {
94 parent::init ();
95 }
96 }
對於$this->getUrlManager ()，YiiBase裡面有'CUrlManager' => 'CUrlManager.php'這個映射，說明是實例化了CUrlManager這個類。
1 <?php
2 class CUrlManager {
3 const GET_FORMAT = 'get';
4 public $rules = array ();
5 public $urlSuffix = '';
6 public $caseSensitive = true;
7 public $urlRuleClass = 'CUrlRule';
8 private $_urlFormat = self::GET_FORMAT;
9 private $_rules = array ();
10 private $_baseUrl;
11 protected function processRules() {
12 //遍歷自定義的請求匹配規則
13 foreach ( $this->rules as $pattern => $route ) {
14 //對每一個規則創建CUrlRule實例
15 $this->_rules [] = $this->createUrlRule ( $route, $pattern );
16 }
17 }
18 protected function createUrlRule($route, $pattern) {
19 if (is_array ( $route ) && isset ( $route ['class'] ))
20 return $route;
21 else {
22 //import第二個參數表示是否立即包含類文件。 如果為flase，則類文件僅在被使用時包含。 這個參數僅當使用一個類的路徑 別名 時才會用到
23 $urlRuleClass = Yii::import ( $this->urlRuleClass, true );
24 //創建CUrlRule實例
25 return new $urlRuleClass ( $route, $pattern );
26 }
27 }
28 //類似於__construct()
29 public function init() {
30 $this->processRules ();
31 }
32 public function parseUrl($request) {
33 //獲取請求
34 $rawPathInfo = $request->getPathInfo ();
35 $pathInfo = $this->removeUrlSuffix ( $rawPathInfo, $this->urlSuffix );
36 foreach ( $this->_rules as $i => $rule ) {
37 if (($r = $rule->parseUrl ( $this, $pathInfo, $rawPathInfo )) !== false) {
38 return $r;
39 }
40 }
41 return $pathInfo;
42 }
43 //解析請求，將請求參數寫入$_REQUEST
44 public function parsePathInfo($pathInfo) {
45 if ($pathInfo === '')
46 return;
47 $segs = explode ( '/', $pathInfo . '/' );
48 $n = count ( $segs );
49 for($i = 0; $i < $n - 1; $i += 2) {
50 $key = $segs [$i];
51 if ($key === '')
52 continue;
53 $value = $segs [$i + 1];
54 if (($pos = strpos ( $key, '[' )) !== false && ($m = preg_match_all ( '/\[(.*?)\]/', $key, $matches )) > 0) {
55 $name = substr ( $key, 0, $pos );
56 for($j = $m - 1; $j >= 0; -- $j) {
57 if ($matches [1] [$j] === '')
58 $value = array (
59 $value
60 );
61 else
62 $value = array (
63 $matches [1] [$j] => $value
64 );
65 }
66 if (isset ( $_GET [$name] ) && is_array ( $_GET [$name] ))
67 $value = CMap::mergeArray ( $_GET [$name], $value );
68 $_REQUEST [$name] = $_GET [$name] = $value;
69 } else {
70 $_REQUEST [$key] = $_GET [$key] = $value;
71 }
72 }
73 }
74 //去除請求後綴，如video/broadcast.html=>video/broadcast
75 public function removeUrlSuffix($pathInfo, $urlSuffix) {
76 if ($urlSuffix !== '' && substr ( $pathInfo, - strlen ( $urlSuffix ) ) === $urlSuffix)
77 return substr ( $pathInfo, 0, - strlen ( $urlSuffix ) );
78 else
79 return $pathInfo;
80 }
81 }
yii在創建組件的時候，在調用了CModule的getComponent($id, $createIfNull = true)裡面調用了$component->init ();。
所以這裡進入init(),然後processRules()遍歷自定義的請求匹配規則。如
1 'urlManager' => array ( 2 'urlFormat' => 'path', 3 'rules' => array ( 4 'comment_reply/<a:\d+>/<ci:\d+>' => 'reply/load_comment_reply', 5 'b/<id:\d+>' => array ( 6 'video/broadcast', 7 'urlSuffix' => '.html' 8 ), 9 'c/<list_start:\d+>' => 'video/list_more_video', 10 'u/reg' => 'user/reg', 11 'v/upload' => 'video/upload_video', 12 'login' => 'user/to_login', 13 'show_chanel/<chanel_id:\d+>' => 'show/chanel' , 14 'show/<show_id:\d+>' => 'show/show', 15 ) 16 )
$this->_rules [] = $this->createUrlRule ( $route, $pattern );對每一個規則創建CUrlRule實例，並保存。
1 <?php
2 class CUrlRule {
3 public $urlSuffix;
4 public $defaultParams = array ();
5 public $route;
6 public $routePattern;
7 public $pattern;
8 public $template;
9 public $params = array ();
10 //根據自定義規則構建匹配參數的正則表達式。
11 public function __construct($route, $pattern) {
12 if (is_array ( $route )) {
13 foreach ( array (
14 'urlSuffix',
15 'caseSensitive',
16 'defaultParams',
17 ) as $name ) {
18 if (isset ( $route [$name] ))
19 $this->$name = $route [$name];
20 }
21 if (isset ( $route ['pattern'] ))
22 $pattern = $route ['pattern'];
23 $route = $route [0];
24 }
25 $this->route = trim ( $route, '/' );
26
27 $tr2 ['/'] = $tr ['/'] = '\\/';
28 $tr ['.'] = '\\.';
29
30 $this->hasHostInfo = ! strncasecmp ( $pattern, 'http://', 7 ) || ! strncasecmp ( $pattern, 'https://', 8 );
31
32 if (preg_match_all ( '/<(\w+):?(.*?)?>/', $pattern, $matches )) {
33 $tokens = array_combine ( $matches [1], $matches [2] );
34 foreach ( $tokens as $name => $value ) {
35 if ($value === '')
36 $value = '[^\/]+';
37 $tr ["<$name>"] = "(?P<$name>$value)";
38 //取出自定義規則中隱藏的參數,保存
39 if (isset ( $this->references [$name] ))
40 $tr2 ["<$name>"] = $tr ["<$name>"];
41 else
42 $this->params [$name] = $value;
43 }
44 }
45 $p = rtrim ( $pattern, '*' );
46 $this->append = $p !== $pattern;
47 $p = trim ( $p, '/' );
48 $this->template = preg_replace ( '/<(\w+):?.*?>/', '<$1>', $p );
49 $this->pattern = '/^' . strtr ( $this->template, $tr ) . '\/';
50 //合成匹配的正則表達式
51 if ($this->append)
52 $this->pattern .= '/u';
53 else
54 $this->pattern .= '$/u';
55 }
56 //根據正則表達式和請求，將隱藏參數與請求參數一一匹配，保存$_REQUEST
57 public function parseUrl($manager, $pathInfo, $rawPathInfo) {
58 if ($this->urlSuffix !== null) {
59 $pathInfo = $manager->removeUrlSuffix ( $rawPathInfo, $this->urlSuffix );
60 }
61 $pathInfo .= '/';
62 if (preg_match ( $this->pattern, $pathInfo, $matches )) {
63 foreach ( $this->defaultParams as $name => $value ) {
64 if (! isset ( $_GET [$name] ))
65 $_REQUEST [$name] = $_GET [$name] = $value;
66 }
67 $tr = array ();
68 foreach ( $matches as $key => $value ) {
69 if (isset ( $this->references [$key] ))
70 $tr [$this->references [$key]] = $value;
71 elseif (isset ( $this->params [$key] ))
72 $_REQUEST [$key] = $_GET [$key] = $value;
73 }
74 if ($pathInfo !== $matches [0]) //如果還有另外的請求參數
75 $manager->parsePathInfo ( ltrim ( substr ( $pathInfo, strlen ( $matches [0] ) ), '/' ) );
76 return $this->route;
77 } else
78 return false;
79 }
80 }
CUrlRule中的parseUrl($manager, $pathInfo, $rawPathInfo)這裡暫時還沒用到。
然後回到CWebApplication中的￥route=$this->getUrlManager ()->parseUrl ($this->getRequest());。後面parseUrl開始解析請求了。
轉到CUrlManager的parseUrl($request)，遍歷創建CUrlRule過程中保存的匹配規則，再在CUrlRule裡面用CUrlRule的parseUrl($manager, $pathInfo, $rawPathInfo)將隱藏參數與請求參數一一匹配，保存$_REQUEST.
比如：
'b/<id:\d+>' => array (
'video/broadcast',
'urlSuffix' => '.html'
)
我的請求是b/1.html，就會被解析成video/broadcast?id=1.而最終的$route就是這個。
