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本文将对yii中的mvc,路由器，filter,组件机制等最主要的部分进行自己的一点浅析，力求说明自己做一个php mvc不是那么的遥不可及，其实是很简单的。
源码基于yii 1.13,为了方便说明，我对其进行了大量的裁剪，不过还是让他保有上面的那些最重要的功能。裁剪下来，其实没有几个文件了，而且每个文件代码最多100多行，避免因为代码太多而懒得看。
所谓的mvc都是让所有请求从一个地方进去，通过对请求，配置的解析，分发到对应的类方法中。
首先当然是入口文件，index.php.
<span>1</span> <?<span>php </span><span>2</span> <span>$app</span> = "app"<span>; </span><span>3</span> <span>$yii</span> = <span>dirname</span> ( <span>__FILE__</span> ) . '/framework/yii.php'<span>; </span><span>4</span> <span>$config</span> = <span>dirname</span> ( <span>__FILE__</span> ) . '/app/protected/config/main.php';<span>//</span><span>载入配置</span> <span>5</span> <span>require_once</span> (<span>$yii</span><span>); </span><span>6</span> Yii::createWebApplication ( <span>$config</span> )->run ();
引入yii.php
<span>1</span> <?<span>php
</span><span>2</span> <span>define</span> ( "VIEWS_DIR", "<span>$app</span>/protected/views/"<span> );
</span><span>3</span> <span>define</span> ( "CONTROLLERS_DIR", "<span>$app</span>/protected/controllers/"<span> );
</span><span>4</span> <span>require</span>(<span>dirname</span>(<span>__FILE__</span>).'/YiiBase.php'<span>);
</span><span>5</span> <span>class</span> Yii <span>extends</span><span> YiiBase
</span><span>6</span> <span>{
</span><span>7</span> }原来yii是个空的类啊，去看YiiBase.
<span> 1</span> <?<span>php
</span><span> 2</span> <span>defined</span> ( 'YII_PATH' ) or <span>define</span> ( 'YII_PATH', <span>dirname</span> ( <span>__FILE__</span><span> ) );
</span><span> 3</span> <span>class</span><span> YiiBase {
</span><span> 4</span> <span>public</span> <span>static</span> <span>$classMap</span> = <span>array</span><span> ();
</span><span> 5</span> <span>public</span> <span>static</span> <span>$enableIncludePath</span> = <span>true</span><span>;
</span><span> 6</span> <span>private</span> <span>static</span> <span>$_aliases</span> = <span>array</span><span> (
</span><span> 7</span> 'system' =><span> YII_PATH
</span><span> 8</span> ); <span>//</span><span> alias => path</span>
<span> 9</span> <span>private</span> <span>static</span> <span>$_imports</span> = <span>array</span> (); <span>//</span><span> alias => class name or directory</span>
<span> 10</span> <span>private</span> <span>static</span> <span>$_includePaths</span>; <span>//</span><span> list of include paths</span>
<span> 11</span> <span>private</span> <span>static</span> <span>$_app</span><span>;
</span><span> 12</span> <span>private</span> <span>static</span> <span>$_logger</span><span>;
</span><span> 13</span> <span>public</span> <span>static</span> <span>function</span> createWebApplication(<span>$config</span> = <span>null</span><span>) {
</span><span> 14</span> <span>return</span> self::createApplication ( 'CWebApplication', <span>$config</span><span> );
</span><span> 15</span> <span> }
</span><span> 16</span> <span>public</span> <span>static</span> <span>function</span> createApplication(<span>$class</span>, <span>$config</span> = <span>null</span><span>) {
</span><span> 17</span> <span>return</span> <span>new</span> <span>$class</span> ( <span>$config</span><span> );
</span><span> 18</span> <span> }
</span><span> 19</span> <span>public</span> <span>static</span> <span>function</span><span> app() {
</span><span> 20</span> <span>return</span> self::<span>$_app</span><span>;
</span><span> 21</span> <span> }
</span><span> 22</span> <span>//</span><span>别名路径</span>
<span> 23</span> <span>public</span> <span>static</span> <span>function</span> getPathOfAlias(<span>$alias</span><span>) {
</span><span> 24</span> <span>if</span> (<span>isset</span> ( self::<span>$_aliases</span> [<span>$alias</span><span>] ))
</span><span> 25</span> <span>return</span> self::<span>$_aliases</span> [<span>$alias</span><span>];
</span><span> 26</span> <span>elseif</span> ((<span>$pos</span> = <span>strpos</span> ( <span>$alias</span>, '.' )) !== <span>false</span><span>) {
</span><span> 27</span> <span>$rootAlias</span> = <span>substr</span> ( <span>$alias</span>, 0, <span>$pos</span><span> );
</span><span> 28</span> <span>if</span> (<span>isset</span> ( self::<span>$_aliases</span> [<span>$rootAlias</span><span>] ))
</span><span> 29</span> <span>return</span> self::<span>$_aliases</span> [<span>$alias</span>] = <span>rtrim</span> ( self::<span>$_aliases</span> [<span>$rootAlias</span>] . DIRECTORY_SEPARATOR . <span>str_replace</span> ( '.', DIRECTORY_SEPARATOR, <span>substr</span> ( <span>$alias</span>, <span>$pos</span> + 1 ) ), '*' .<span> DIRECTORY_SEPARATOR );
</span><span> 30</span> <span> }
</span><span> 31</span> <span>return</span> <span>false</span><span>;
</span><span> 32</span> <span> }
</span><span> 33</span> <span>public</span> <span>static</span> <span>function</span> setPathOfAlias(<span>$alias</span>, <span>$path</span><span>) {
</span><span> 34</span> <span>if</span> (<span>empty</span> ( <span>$path</span><span> ))
</span><span> 35</span> <span>unset</span> ( self::<span>$_aliases</span> [<span>$alias</span><span>] );
</span><span> 36</span> <span>else</span>
<span> 37</span> self::<span>$_aliases</span> [<span>$alias</span>] = <span>rtrim</span> ( <span>$path</span>, '\\/'<span> );
</span><span> 38</span> <span> }
</span><span> 39</span> <span>public</span> <span>static</span> <span>function</span> setApplication(<span>$app</span><span>) {
</span><span> 40</span> <span>if</span> (self::<span>$_app</span> === <span>null</span> || <span>$app</span> === <span>null</span><span>)
</span><span> 41</span> self::<span>$_app</span> = <span>$app</span><span>;
</span><span> 42</span> <span> }
</span><span> 43</span> <span>public</span> <span>static</span> <span>function</span> import(<span>$alias</span>, <span>$forceInclude</span> = <span>false</span><span>) {
</span><span> 44</span> <span>if</span> (<span>isset</span> ( self::<span>$_imports</span> [<span>$alias</span>] )) <span>//</span><span> previously imported</span>
<span> 45</span> <span>return</span> self::<span>$_imports</span> [<span>$alias</span><span>];
</span><span> 46</span>
<span> 47</span> <span>if</span> (<span>class_exists</span> ( <span>$alias</span>, <span>false</span> ) || <span>interface_exists</span> ( <span>$alias</span>, <span>false</span><span> ))
</span><span> 48</span> <span>return</span> self::<span>$_imports</span> [<span>$alias</span>] = <span>$alias</span><span>;
</span><span> 49</span> <span>if</span> ((<span>$pos</span> = <span>strrpos</span> ( <span>$alias</span>, '.' )) === <span>false</span>) <span>//</span><span> a simple class name</span>
<span> 50</span> <span> {
</span><span> 51</span> <span>//</span><span> try to autoload the class with an autoloader if $forceInclude is true</span>
<span> 52</span> <span>if</span> (<span>$forceInclude</span> && (Yii::autoload ( <span>$alias</span>, <span>true</span> ) || <span>class_exists</span> ( <span>$alias</span>, <span>true</span><span> )))
</span><span> 53</span> self::<span>$_imports</span> [<span>$alias</span>] = <span>$alias</span><span>;
</span><span> 54</span> <span>return</span> <span>$alias</span><span>;
</span><span> 55</span> <span> }
</span><span> 56</span>
<span> 57</span> <span>$className</span> = ( <span>string</span> ) <span>substr</span> ( <span>$alias</span>, <span>$pos</span> + 1<span> );
</span><span> 58</span> <span>$isClass</span> = <span>$className</span> !== '*'<span>;
</span><span> 59</span>
<span> 60</span> <span>if</span> (<span>$isClass</span> && (<span>class_exists</span> ( <span>$className</span>, <span>false</span> ) || <span>interface_exists</span> ( <span>$className</span>, <span>false</span><span> )))
</span><span> 61</span> <span>return</span> self::<span>$_imports</span> [<span>$alias</span>] = <span>$className</span><span>;
</span><span> 62</span>
<span> 63</span> <span>if</span> ((<span>$path</span> = self::getPathOfAlias ( <span>$alias</span> )) !== <span>false</span><span>) {
</span><span> 64</span> <span>if</span> (<span>$isClass</span><span>) {
</span><span> 65</span> <span>if</span> (<span>$forceInclude</span><span>) {
</span><span> 66</span> <span>if</span> (<span>is_file</span> ( <span>$path</span> . '.php'<span> ))
</span><span> 67</span> <span>require</span> (<span>$path</span> . '.php'<span>);
</span><span> 68</span> <span>else</span>
<span> 69</span> <span>throw</span> <span>new</span> CException ( Yii::t ( 'yii', 'Alias "{alias}" is invalid. Make sure it points to an existing PHP file and the file is readable.', <span>array</span><span> (
</span><span> 70</span> '{alias}' => <span>$alias</span>
<span> 71</span> <span> ) ) );
</span><span> 72</span> self::<span>$_imports</span> [<span>$alias</span>] = <span>$className</span><span>;
</span><span> 73</span> } <span>else</span>
<span> 74</span> self::<span>$classMap</span> [<span>$className</span>] = <span>$path</span> . '.php'<span>;
</span><span> 75</span> <span>return</span> <span>$className</span><span>;
</span><span> 76</span> } <span>else</span> <span>//</span><span> a directory</span>
<span> 77</span> <span> {
</span><span> 78</span> <span>if</span> (self::<span>$_includePaths</span> === <span>null</span><span>) {
</span><span> 79</span> self::<span>$_includePaths</span> = <span>array_unique</span> ( <span>explode</span> ( PATH_SEPARATOR, <span>get_include_path</span><span> () ) );
</span><span> 80</span> <span>if</span> ((<span>$pos</span> = <span>array_search</span> ( '.', self::<span>$_includePaths</span>, <span>true</span> )) !== <span>false</span><span>)
</span><span> 81</span> <span>unset</span> ( self::<span>$_includePaths</span> [<span>$pos</span><span>] );
</span><span> 82</span> <span> }
</span><span> 83</span>
<span> 84</span> <span>array_unshift</span> ( self::<span>$_includePaths</span>, <span>$path</span><span> );
</span><span> 85</span>
<span> 86</span> <span>if</span> (self::<span>$enableIncludePath</span> && <span>set_include_path</span> ( '.' . PATH_SEPARATOR . <span>implode</span> ( PATH_SEPARATOR, self::<span>$_includePaths</span> ) ) === <span>false</span><span>)
</span><span> 87</span> self::<span>$enableIncludePath</span> = <span>false</span><span>;
</span><span> 88</span>
<span> 89</span> <span>return</span> self::<span>$_imports</span> [<span>$alias</span>] = <span>$path</span><span>;
</span><span> 90</span> <span> }
</span><span> 91</span> <span> }
</span><span> 92</span> <span> }
</span><span> 93</span> <span>//</span><span>创建组件实例</span>
<span> 94</span> <span>public</span> <span>static</span> <span>function</span> createComponent(<span>$config</span><span>) {
</span><span> 95</span> <span>if</span> (<span>is_string</span> ( <span>$config</span><span> )) {
</span><span> 96</span> <span>$type</span> = <span>$config</span><span>;
</span><span> 97</span> <span>$config</span> = <span>array</span><span> ();
</span><span> 98</span> } <span>elseif</span> (<span>isset</span> ( <span>$config</span> ['class'<span>] )) {
</span><span> 99</span> <span>$type</span> = <span>$config</span> ['class'<span>];
</span><span>100</span> <span>unset</span> ( <span>$config</span> ['class'<span>] );
</span><span>101</span> <span> }
</span><span>102</span> <span>if</span> (! <span>class_exists</span> ( <span>$type</span>, <span>false</span><span> )) {
</span><span>103</span> <span>$type</span> = Yii::import ( <span>$type</span>, <span>true</span><span> );
</span><span>104</span> <span> }
</span><span>105</span> <span>if</span> ((<span>$n</span> = <span>func_num_args</span> ()) > 1<span>) {
</span><span>106</span> <span>$args</span> = <span>func_get_args</span><span> ();
</span><span>107</span> <span>if</span> (<span>$n</span> === 2<span>)
</span><span>108</span> <span>$object</span> = <span>new</span> <span>$type</span> ( <span>$args</span> [1<span>] );
</span><span>109</span> <span>elseif</span> (<span>$n</span> === 3<span>)
</span><span>110</span> <span>$object</span> = <span>new</span> <span>$type</span> ( <span>$args</span> [1], <span>$args</span> [2<span>] );
</span><span>111</span> <span>elseif</span> (<span>$n</span> === 4<span>)
</span><span>112</span> <span>$object</span> = <span>new</span> <span>$type</span> ( <span>$args</span> [1], <span>$args</span> [2], <span>$args</span> [3<span>] );
</span><span>113</span> <span>else</span><span> {
</span><span>114</span> <span>unset</span> ( <span>$args</span> [0<span>] );
</span><span>115</span> <span>$class</span> = <span>new</span> ReflectionClass ( <span>$type</span><span> );
</span><span>116</span> <span>//</span><span> Note: ReflectionClass::newInstanceArgs() is available for PHP 5.1.3+
</span><span>117</span> <span> // $object=$class->newInstanceArgs($args);</span>
<span>118</span> <span>$object</span> = <span>call_user_func_array</span> ( <span>array</span><span> (
</span><span>119</span> <span>$class</span>,
<span>120</span> 'newInstance'
<span>121</span> ), <span>$args</span><span> );
</span><span>122</span> <span> }
</span><span>123</span> } <span>else</span>
<span>124</span> <span>$object</span> = <span>new</span> <span>$type</span><span> ();
</span><span>125</span> <span>foreach</span> ( <span>$config</span> <span>as</span> <span>$key</span> => <span>$value</span><span> )
</span><span>126</span> <span>$object</span>-><span>$key</span> = <span>$value</span><span>;
</span><span>127</span>
<span>128</span> <span>return</span> <span>$object</span><span>;
</span><span>129</span> <span> }
</span><span>130</span> <span>//</span><span>按需加载相应的php</span>
<span>131</span> <span>public</span> <span>static</span> <span>function</span> autoload(<span>$className</span><span>) {
</span><span>132</span> <span>include</span> self::<span>$_coreClasses</span> [<span>$className</span><span>];
</span><span>133</span> <span> }
</span><span>134</span> <span>private</span> <span>static</span> <span>$_coreClasses</span> = <span>array</span><span> (
</span><span>135</span> 'CApplication' => '/base/CApplication.php',
<span>136</span> 'CModule' => '/base/CModule.php',
<span>137</span> 'CWebApplication' => '/base/CWebApplication.php',
<span>138</span> 'CUrlManager' => 'CUrlManager.php',
<span>139</span> 'CComponent' => '/base/CComponent.php'
<span>140</span> , 'CUrlRule' => 'CUrlRule.php',
<span>141</span> 'CController' => 'CController.php',
<span>142</span> 'CInlineAction' => '/actions/CInlineAction.php',
<span>143</span> 'CAction' => '/actions/CAction.php',
<span>144</span> 'CFilterChain' => '/filters/CFilterChain.php',
<span>145</span> 'CFilter' => '/filters/CFilter.php',
<span>146</span> 'CList' => '/collections/CList.php',
<span>147</span> 'CHttpRequest' => 'CHttpRequest.php',
<span>148</span> 'CDb' => 'CDb.php',
<span>149</span> 'CInlineFilter' => 'filters/CInlineFilter.php'
<span>150</span> <span> );
</span><span>151</span> <span>}
</span><span>152</span>
<span>153</span> spl_autoload_register ( <span>array</span><span> (
</span><span>154</span> 'YiiBase',
<span>155</span> 'autoload'
<span>156</span> ) );看似很多，其实就三个地方注意下就可以了
1.spl_autoload_register,用这个就可以实现传说中的按需加载相应的php了,坑爹啊。
2.createComponent($config)这个方法是yii组件调用的核心。在配置中注册的所有组件都是通过它获取组件类的实例的。比如配置：
<span> 1</span> <?<span>php </span><span> 2</span> <span>return</span> <span>array</span><span> ( </span><span> 3</span> 'basePath' => <span>dirname</span> ( <span>__FILE__</span> ) . DIRECTORY_SEPARATOR . '..', <span> 4</span> <span> 5</span> 'import' => <span>array</span><span> ( </span><span> 6</span> 'application.util.*' <span> 7</span> ), <span> 8</span> <span> 9</span> 'components' => <span>array</span><span> ( </span><span>10</span> 'db' => <span>array</span><span> ( </span><span>11</span> 'class' => 'CDb', <span>12</span> 'driver' => 'mysql', <span>13</span> 'hostname' => 'localhost', <span>14</span> 'username' => 'root', <span>15</span> 'password' => '', <span>16</span> 'database' => 'youtube' <span>17</span> ), <span>18</span> 'urlManager' => <span>array</span><span> ( </span><span>19</span> 'urlFormat' => 'path', <span>20</span> 'rules' => <span>array</span><span> ( </span><span>21</span> 'comment_reply/<a:\d+>/<ci:\d+>' => 'reply/load_comment_reply', <span>22</span> 'b/<id:\d+>' => <span>array</span><span> ( </span><span>23</span> 'video/broadcast', <span>24</span> 'urlSuffix' => '.html' <span>25</span> ), <span>26</span> 'c/<list_start:\d+>' => 'video/list_more_video', <span>27</span> 'u/reg' => 'user/reg', <span>28</span> 'v/upload' => 'video/upload_video', <span>29</span> 'login' => 'user/to_login', <span>30</span> 'show_chanel/<chanel_id:\d+>' => 'show/chanel' , <span>31</span> 'show/<show_id:\d+>' => 'show/show', <span>32</span> <span> ) </span><span>33</span> <span> ) </span><span>34</span> <span> ) </span><span>35</span> <span>); </span><span>36</span> ?>
这个文件就返回了个map,里面components中的db,urlManager便是我注册的系统中的组件,里面的array便是组件的参数.
从源码中看到$type = $config ['class'];$object = new $type;就创建了注册的类实例了。
3.import($alias, $forceInclude = false)。作用：导入一个类或一个目录。导入一个类就像包含相应的类文件。 主要区别是导入一个类比较轻巧， 它仅在类文件首次引用时包含。这个也是yii的一个核心优化点。
这个在上面createComponent($config)中有用到，
if (!class_exists ( $type, false )) {
$type = Yii::import ( $type, true );
}
如果$type类没有定义，就去导入。有些组件，核心在yii中多次create调用，这样就保证了仅在类文件首次引用时导入。
下面分析index.php中Yii::createWebApplication ( $config )的调用过程。
这个调用是去了CWebApplication。
<span> 1</span> <?<span>php
</span><span> 2</span> <span>class</span> CWebApplication <span>extends</span><span> CApplication {
</span><span> 3</span> <span>public</span> <span>$controllerNamespace</span><span>;
</span><span> 4</span> <span>private</span> <span>$_controllerPath</span><span>;
</span><span> 5</span> <span>private</span> <span>$_viewPath</span><span>;
</span><span> 6</span> <span>private</span> <span>$_systemViewPath</span><span>;
</span><span> 7</span> <span>private</span> <span>$_controller</span><span>;
</span><span> 8</span> <span>public</span> <span>$controllerMap</span>=<span>array</span><span>();
</span><span> 9</span> <span>public</span> <span>function</span> processRequest() {<span>//</span><span>开始执行请求
</span><span>10</span> <span> //获取urlManager组件，解析请求，得到controller/action这种格式的string,
</span><span>11</span> <span> //并且将隐藏参数与请求的参数一一对应，匹配起来，写入$_REQUEST中</span>
<span>12</span> <span>$route</span> = <span>$this</span>->getUrlManager ()->parseUrl (<span>$this</span>-><span>getRequest());
</span><span>13</span> <span>$this</span>->runController ( <span>$route</span><span> );
</span><span>14</span> <span> }
</span><span>15</span> <span>public</span> <span>function</span> getRequest() {<span>//</span><span>获取request组件</span>
<span>16</span> <span>return</span> <span>$this</span>->getComponent ( 'request'<span> );
</span><span>17</span> <span> }
</span><span>18</span> <span>protected</span> <span>function</span> registerCoreComponents() {<span>//</span><span>注册核心组件</span>
<span>19</span> parent::<span>registerCoreComponents ();
</span><span>20</span> <span> }
</span><span>21</span> <span>//</span><span>执行contronller</span>
<span>22</span> <span>public</span> <span>function</span> runController(<span>$route</span><span>) {
</span><span>23</span> <span>if</span> ((<span>$ca</span> = <span>$this</span>->createController ( <span>$route</span> )) !== <span>null</span><span>) {
</span><span>24</span> <span>list</span> ( <span>$controller</span>, <span>$actionID</span> ) = <span>$ca</span><span>;
</span><span>25</span> <span>$oldController</span> = <span>$this</span>-><span>_controller;
</span><span>26</span> <span>$this</span>->_controller = <span>$controller</span><span>;
</span><span>27</span> <span>$controller</span>->init ();<span>//</span><span>钩子,在执行action方法前调用，子类去实现</span>
<span>28</span> <span>$controller</span>->run ( <span>$actionID</span> );<span>//</span><span>开始转入controller类中action方法的执行</span>
<span>29</span> <span>$this</span>->_controller = <span>$oldController</span><span>;
</span><span>30</span> <span> }
</span><span>31</span> <span> }
</span><span>32</span> <span>//</span><span>创建controller类实例,从controller/action这种格式的string中解析出$controller, $actionID </span>
<span>33</span> <span>public</span> <span>function</span> createController(<span>$route</span>, <span>$owner</span> = <span>null</span><span>) {
</span><span>34</span> <span>if</span> (<span>$owner</span> === <span>null</span><span>)
</span><span>35</span> <span>$owner</span> = <span>$this</span><span>;
</span><span>36</span> <span>if</span> ((<span>$route</span> = <span>trim</span> ( <span>$route</span>, '/' )) === ''<span>)
</span><span>37</span> <span>$route</span> = <span>$owner</span>-><span>defaultController;
</span><span>38</span>
<span>39</span> <span>$route</span> .= '/'<span>;
</span><span>40</span> <span>while</span> ( (<span>$pos</span> = <span>strpos</span> ( <span>$route</span>, '/' )) !== <span>false</span><span> ) {
</span><span>41</span> <span>$id</span> = <span>substr</span> ( <span>$route</span>, 0, <span>$pos</span><span> );
</span><span>42</span> <span>if</span> (! <span>preg_match</span> ( '/^\w+$/', <span>$id</span><span> ))
</span><span>43</span> <span>return</span> <span>null</span><span>;
</span><span>44</span> <span>$id</span> = <span>strtolower</span> ( <span>$id</span><span> );
</span><span>45</span> <span>$route</span> = ( <span>string</span> ) <span>substr</span> ( <span>$route</span>, <span>$pos</span> + 1<span> );
</span><span>46</span> <span>if</span> (! <span>isset</span> ( <span>$basePath</span> )) <span>//</span><span> first segment</span>
<span>47</span> <span> {
</span><span>48</span> <span>$basePath</span> = <span>$owner</span>-><span>getControllerPath ();
</span><span>49</span> <span>$controllerID</span> = ''<span>;
</span><span>50</span> } <span>else</span><span> {
</span><span>51</span> <span>$controllerID</span> .= '/'<span>;
</span><span>52</span> <span> }
</span><span>53</span> <span>$className</span> = <span>ucfirst</span> ( <span>$id</span> ) . 'Controller'<span>;
</span><span>54</span> <span>$classFile</span> = <span>$basePath</span> . DIRECTORY_SEPARATOR . <span>$className</span> . '.php'<span>;
</span><span>55</span>
<span>56</span> <span>if</span> (<span>is_file</span> ( <span>$classFile</span><span> )) {
</span><span>57</span> <span>if</span> (! <span>class_exists</span> ( <span>$className</span>, <span>false</span><span> ))
</span><span>58</span> <span>require</span> (<span>$classFile</span><span>);
</span><span>59</span> <span>if</span> (<span>class_exists</span> ( <span>$className</span>, <span>false</span> ) && <span>is_subclass_of</span> ( <span>$className</span>, 'CController'<span> )) {
</span><span>60</span> <span>$id</span> [0] = <span>strtolower</span> ( <span>$id</span> [0<span>] );
</span><span>61</span> <span>return</span> <span>array</span><span> (
</span><span>62</span> <span>new</span> <span>$className</span> ( <span>$controllerID</span> . <span>$id</span>, <span>$owner</span> === <span>$this</span> ? <span>null</span> : <span>$owner</span> ),
<span>63</span> <span>$this</span>->parseActionParams ( <span>$route</span><span> )
</span><span>64</span> <span> );
</span><span>65</span> <span> }
</span><span>66</span> <span>return</span> <span>null</span><span>;
</span><span>67</span> <span> }
</span><span>68</span> <span>$controllerID</span> .= <span>$id</span><span>;
</span><span>69</span> <span>$basePath</span> .= DIRECTORY_SEPARATOR . <span>$id</span><span>;
</span><span>70</span> <span> }
</span><span>71</span> <span> }
</span><span>72</span> <span>protected</span> <span>function</span> parseActionParams(<span>$pathInfo</span><span>) {
</span><span>73</span> <span>if</span> ((<span>$pos</span> = <span>strpos</span> ( <span>$pathInfo</span>, '/' )) !== <span>false</span><span>) {
</span><span>74</span> <span>$manager</span> = <span>$this</span>->getUrlManager ();<span>//</span><span>再次获取urlManager,在上面第一次调用中已经导入。</span>
<span>75</span> <span>$manager</span>->parsePathInfo ( ( <span>string</span> ) <span>substr</span> ( <span>$pathInfo</span>, <span>$pos</span> + 1<span> ) );
</span><span>76</span> <span>$actionID</span> = <span>substr</span> ( <span>$pathInfo</span>, 0, <span>$pos</span><span> );
</span><span>77</span> <span>return</span> <span>$manager</span>->caseSensitive ? <span>$actionID</span> : <span>strtolower</span> ( <span>$actionID</span><span> );
</span><span>78</span> } <span>else</span>
<span>79</span> <span>return</span> <span>$pathInfo</span><span>;
</span><span>80</span> <span> }
</span><span>81</span> <span>public</span> <span>function</span><span> getControllerPath() {
</span><span>82</span> <span>if</span> (<span>$this</span>->_controllerPath !== <span>null</span><span>)
</span><span>83</span> <span>return</span> <span>$this</span>-><span>_controllerPath;
</span><span>84</span> <span>else</span>
<span>85</span> <span>return</span> <span>$this</span>->_controllerPath = <span>$this</span>->getBasePath () . DIRECTORY_SEPARATOR . 'controllers'<span>;
</span><span>86</span> <span> }
</span><span>87</span> <span>//</span><span>两个钩子,子类去实现</span>
<span>88</span> <span>public</span> <span>function</span> beforeControllerAction(<span>$controller</span>, <span>$action</span><span>) {
</span><span>89</span> <span>return</span> <span>true</span><span>;
</span><span>90</span> <span> }
</span><span>91</span> <span>public</span> <span>function</span> afterControllerAction(<span>$controller</span>, <span>$action</span><span>) {
</span><span>92</span> <span> }
</span><span>93</span> <span>protected</span> <span>function</span><span> init() {
</span><span>94</span> parent::<span>init ();
</span><span>95</span> <span> }
</span><span>96</span> }没有构造方法，构造方法在父类CApplication里面。
<span> 1</span> <?<span>php
</span><span> 2</span> <span>abstract</span> <span>class</span> CApplication <span>extends</span><span> CModule {
</span><span> 3</span> <span>private</span> <span>$_id</span><span>;
</span><span> 4</span> <span>private</span> <span>$_basePath</span><span>;
</span><span> 5</span> <span>abstract</span> <span>public</span> <span>function</span><span> processRequest();
</span><span> 6</span> <span>public</span> <span>function</span> __construct(<span>$config</span> = <span>null</span><span>) {
</span><span> 7</span> <span>if</span> (<span>is_string</span> ( <span>$config</span><span> ))
</span><span> 8</span> <span>$config</span> = <span>require</span> (<span>$config</span><span>);
</span><span> 9</span> Yii::setApplication ( <span>$this</span> );<span>//</span><span>保存整个app实例</span>
<span>10</span> <span>if</span> (<span>isset</span> ( <span>$config</span> ['basePath'<span>] )) {
</span><span>11</span> <span>$this</span>->setBasePath ( <span>$config</span> ['basePath'<span>] );
</span><span>12</span> <span>unset</span> ( <span>$config</span> ['basePath'<span>] );
</span><span>13</span> } <span>else</span>
<span>14</span> <span>$this</span>->setBasePath ( 'protected'<span> );
</span><span>15</span> <span>//</span><span>设置别名,后面就可以用application表示basePath了</span>
<span>16</span> Yii::setPathOfAlias ( 'application', <span>$this</span>-><span>getBasePath () );
</span><span>17</span> <span>//</span><span>钩子，模块 预 初始化时执行，子类实现。不过这时，配置还没有写入框架</span>
<span>18</span> <span>$this</span>-><span>preinit ();
</span><span>19</span> <span>$this</span>-><span>registerCoreComponents ();
</span><span>20</span> <span>//</span><span>父类实现</span>
<span>21</span> <span>$this</span>->configure ( <span>$config</span><span> );
</span><span>22</span> <span>//</span><span>加载静态应用组件</span>
<span>23</span> <span>$this</span>-><span>preloadComponents ();
</span><span>24</span> <span>//</span><span>这才开始初始化模块</span>
<span>25</span> <span>$this</span>-><span>init ();
</span><span>26</span> <span> }
</span><span>27</span> <span>protected</span> <span>function</span><span> registerCoreComponents() {
</span><span>28</span> <span>$components</span> = <span>array</span><span> (
</span><span>29</span> 'request' => <span>array</span><span> (
</span><span>30</span> 'class' => 'CHttpRequest'
<span>31</span> ),
<span>32</span> 'urlManager' => <span>array</span><span> (
</span><span>33</span> 'class' => 'CUrlManager'
<span>34</span> <span> )
</span><span>35</span> <span> );
</span><span>36</span>
<span>37</span> <span>$this</span>->setComponents ( <span>$components</span> );<span>//</span><span>父类实现</span>
<span>38</span> <span> }
</span><span>39</span> <span>public</span> <span>function</span><span> run() {
</span><span>40</span> <span>$this</span>-><span>processRequest ();
</span><span>41</span> <span> }
</span><span>42</span> <span>public</span> <span>function</span><span> getId() {
</span><span>43</span> <span>if</span> (<span>$this</span>->_id !== <span>null</span><span>)
</span><span>44</span> <span>return</span> <span>$this</span>-><span>_id;
</span><span>45</span> <span>else</span>
<span>46</span> <span>return</span> <span>$this</span>->_id = <span>sprintf</span> ( '%x', <span>crc32</span> ( <span>$this</span>->getBasePath () . <span>$this</span>-><span>name ) );
</span><span>47</span> <span> }
</span><span>48</span> <span>public</span> <span>function</span> setId(<span>$id</span><span>) {
</span><span>49</span> <span>$this</span>->_id = <span>$id</span><span>;
</span><span>50</span> <span> }
</span><span>51</span> <span>public</span> <span>function</span><span> getBasePath() {
</span><span>52</span> <span>return</span> <span>$this</span>-><span>_basePath;
</span><span>53</span> <span> }
</span><span>54</span> <span>public</span> <span>function</span> setBasePath(<span>$path</span><span>) {
</span><span>55</span> <span>if</span> ((<span>$this</span>->_basePath = <span>realpath</span> ( <span>$path</span> )) === <span>false</span> || ! <span>is_dir</span> ( <span>$this</span>-><span>_basePath ))
</span><span>56</span> <span>return</span><span>;
</span><span>57</span> <span> }
</span><span>58</span> <span>public</span> <span>function</span><span> getDb() {
</span><span>59</span> <span>return</span> <span>$this</span>->getComponent ( 'db' );<span>//</span><span>父类实现</span>
<span>60</span> <span> }
</span><span>61</span> <span>public</span> <span>function</span><span> getUrlManager() {
</span><span>62</span> <span>return</span> <span>$this</span>->getComponent ( 'urlManager'<span> );
</span><span>63</span> <span> }
</span><span>64</span> <span>public</span> <span>function</span><span> getController() {
</span><span>65</span> <span>return</span> <span>null</span><span>;
</span><span>66</span> <span> }
</span><span>67</span> <span>public</span> <span>function</span> getBaseUrl(<span>$absolute</span> = <span>false</span><span>) {
</span><span>68</span> <span>return</span> <span>$this</span>->getRequest ()->getBaseUrl ( <span>$absolute</span><span> );
</span><span>69</span> <span> }
</span><span>70</span> }__construct里面注释写的很详细了，值得注意的是registerCoreComponents ()。前面说了那么多，那么Yii::createWebApplication ( $config )到底是做什么的。
其实最终目的对这个裁剪过的yii而言就是注册核心组件。就这么简单.
setComponents ( $components )在父类CModule里面.
<span> 1</span> <?<span>php
</span><span> 2</span> <span>abstract</span> <span>class</span> CModule <span>extends</span><span> CComponent {
</span><span> 3</span> <span>public</span> <span>$preload</span> = <span>array</span><span> ();
</span><span> 4</span> <span>public</span> <span>$behaviors</span> = <span>array</span><span> ();
</span><span> 5</span> <span>private</span> <span>$_id</span><span>;
</span><span> 6</span> <span>private</span> <span>$_parentModule</span><span>;
</span><span> 7</span> <span>private</span> <span>$_basePath</span><span>;
</span><span> 8</span> <span>private</span> <span>$_modulePath</span><span>;
</span><span> 9</span> <span>private</span> <span>$_params</span><span>;
</span><span>10</span> <span>private</span> <span>$_modules</span> = <span>array</span><span> ();
</span><span>11</span> <span>private</span> <span>$_moduleConfig</span> = <span>array</span><span> ();
</span><span>12</span> <span>private</span> <span>$_components</span> = <span>array</span><span> ();
</span><span>13</span> <span>private</span> <span>$_componentConfig</span> = <span>array</span><span> ();
</span><span>14</span> <span>//</span><span>重写是为了方便直接用 application.组件 这种方式直接获取组件</span>
<span>15</span> <span>public</span> <span>function</span> __get(<span>$name</span><span>) {
</span><span>16</span> <span>if</span> (<span>$this</span>->hasComponent ( <span>$name</span><span> ))
</span><span>17</span> <span>return</span> <span>$this</span>->getComponent ( <span>$name</span><span> );
</span><span>18</span> <span>else</span>
<span>19</span> <span>return</span> parent::__get ( <span>$name</span><span> );
</span><span>20</span> <span> }
</span><span>21</span> <span>public</span> <span>function</span> __isset(<span>$name</span><span>) {
</span><span>22</span> <span>if</span> (<span>$this</span>->hasComponent ( <span>$name</span><span> ))
</span><span>23</span> <span>return</span> <span>$this</span>->getComponent ( <span>$name</span> ) !== <span>null</span><span>;
</span><span>24</span> <span>else</span>
<span>25</span> <span>return</span> parent::__isset ( <span>$name</span><span> );
</span><span>26</span> <span> }
</span><span>27</span> <span>public</span> <span>function</span> hasComponent(<span>$id</span><span>) {
</span><span>28</span> <span>return</span> <span>isset</span> ( <span>$this</span>->_components [<span>$id</span>] ) || <span>isset</span> ( <span>$this</span>->_componentConfig [<span>$id</span><span>] );
</span><span>29</span> <span> }
</span><span>30</span> <span>//
</span><span>31</span> <span>public</span> <span>function</span> getComponent(<span>$id</span>, <span>$createIfNull</span> = <span>true</span><span>) {
</span><span>32</span> <span>if</span> (<span>isset</span> ( <span>$this</span>->_components [<span>$id</span><span>] ))
</span><span>33</span> <span>return</span> <span>$this</span>->_components [<span>$id</span><span>];
</span><span>34</span> <span>else</span> <span>if</span> (<span>isset</span> ( <span>$this</span>->_componentConfig [<span>$id</span>] ) && <span>$createIfNull</span><span>) {
</span><span>35</span> <span>$config</span> = <span>$this</span>->_componentConfig [<span>$id</span><span>];
</span><span>36</span> <span>$component</span> = Yii::createComponent ( <span>$config</span> );<span>//</span><span>YiiBase,返回组件实例</span>
<span>37</span> <span>$component</span>->init ();<span>//</span><span>钩子，调用子类重写的init方法
</span><span>38</span> <span> //将组件写入数组保存，并返回</span>
<span>39</span> <span>return</span> <span>$this</span>->_components [<span>$id</span>] = <span>$component</span><span>;
</span><span>40</span> <span> }
</span><span>41</span> <span> }
</span><span>42</span> <span>public</span> <span>function</span> setComponent(<span>$id</span>, <span>$component</span>, <span>$merge</span> = <span>true</span><span>) {
</span><span>43</span> <span>//</span><span>组件写入数组保存</span>
<span>44</span> <span>if</span> (<span>isset</span> ( <span>$this</span>->_componentConfig [<span>$id</span>] ) && <span>$merge</span><span>) {
</span><span>45</span>
<span>46</span> <span>$this</span>->_componentConfig [<span>$id</span>] = self::mergeArray ( <span>$this</span>->_componentConfig [<span>$id</span>], <span>$component</span><span> );
</span><span>47</span> } <span>else</span><span> {
</span><span>48</span>
<span>49</span> <span>$this</span>->_componentConfig [<span>$id</span>] = <span>$component</span><span>;
</span><span>50</span> <span> }
</span><span>51</span> <span> }
</span><span>52</span> <span>public</span> <span>static</span> <span>function</span> mergeArray(<span>$a</span>, <span>$b</span><span>) {
</span><span>53</span> <span>$args</span> = <span>func_get_args</span><span> ();
</span><span>54</span> <span>$res</span> = <span>array_shift</span> ( <span>$args</span><span> );
</span><span>55</span> <span>while</span> ( ! <span>empty</span> ( <span>$args</span><span> ) ) {
</span><span>56</span> <span>$next</span> = <span>array_shift</span> ( <span>$args</span><span> );
</span><span>57</span> <span>foreach</span> ( <span>$next</span> <span>as</span> <span>$k</span> => <span>$v</span><span> ) {
</span><span>58</span> <span>if</span> (<span>is_integer</span> ( <span>$k</span><span> ))
</span><span>59</span> <span>isset</span> ( <span>$res</span> [<span>$k</span>] ) ? <span>$res</span> [] = <span>$v</span> : <span>$res</span> [<span>$k</span>] = <span>$v</span><span>;
</span><span>60</span> <span>elseif</span> (<span>is_array</span> ( <span>$v</span> ) && <span>isset</span> ( <span>$res</span> [<span>$k</span>] ) && <span>is_array</span> ( <span>$res</span> [<span>$k</span><span>] ))
</span><span>61</span> <span>$res</span> [<span>$k</span>] = self::mergeArray ( <span>$res</span> [<span>$k</span>], <span>$v</span><span> );
</span><span>62</span> <span>else</span>
<span>63</span> <span>$res</span> [<span>$k</span>] = <span>$v</span><span>;
</span><span>64</span> <span> }
</span><span>65</span> <span> }
</span><span>66</span> <span>return</span> <span>$res</span><span>;
</span><span>67</span> <span> }
</span><span>68</span> <span>public</span> <span>function</span> setComponents(<span>$components</span>, <span>$merge</span> = <span>true</span><span>) {
</span><span>69</span> <span>foreach</span> ( <span>$components</span> <span>as</span> <span>$id</span> => <span>$component</span><span> )
</span><span>70</span> <span>$this</span>->setComponent ( <span>$id</span>, <span>$component</span>, <span>$merge</span><span> );
</span><span>71</span> <span> }
</span><span>72</span> <span>//</span><span>子类CApplication调用，用来为模块指定配置</span>
<span>73</span> <span>public</span> <span>function</span> configure(<span>$config</span><span>) {
</span><span>74</span> <span>if</span> (<span>is_array</span> ( <span>$config</span><span> )) {
</span><span>75</span> <span>foreach</span> ( <span>$config</span> <span>as</span> <span>$key</span> => <span>$value</span><span> )
</span><span>76</span> <span>$this</span>-><span>$key</span> = <span>$value</span><span>;
</span><span>77</span> <span> }
</span><span>78</span> <span> }
</span><span>79</span> <span>protected</span> <span>function</span><span> preloadComponents() {
</span><span>80</span> <span>foreach</span> ( <span>$this</span>->preload <span>as</span> <span>$id</span><span> )
</span><span>81</span> <span>$this</span>->getComponent ( <span>$id</span><span> );
</span><span>82</span> <span> }
</span><span>83</span> <span>//</span><span>又是两个钩子</span>
<span>84</span> <span>protected</span> <span>function</span><span> preinit() {
</span><span>85</span> <span> }
</span><span>86</span> <span>protected</span> <span>function</span><span> init() {
</span><span>87</span> <span> }
</span><span>88</span> }看到所谓的注册组件就是写入数组保存，getComponent()的时候就是用前面讲到的YiiBase里面的createComponent($config)返回组件实例。就这么简单。
而CApplication里面的什么getDb()，getUrlManager()也是在调用getComponent()。
