Action是所有控制器的基类，接下来了解一下它的源码。yii2\base\Action.php
<span> 1</span> <?<span>php
</span><span> 2</span> <span>/*</span><span>*
</span><span> 3</span> <span> * @link </span><span>http://www.yiiframework.com/</span>
<span> 4</span> <span> * @copyright Copyright (c) 2008 Yii Software LLC
</span><span> 5</span> <span> * @license </span><span>http://www.yiiframework.com/license/</span>
<span> 6</span> <span>*/</span>
<span> 7</span>
<span> 8</span> <span>namespace</span> yii\<span>base</span><span>;
</span><span> 9</span>
<span> 10</span> <span>use Yii;
</span><span> 11</span>
<span> 12</span> <span>/*</span><span>*
</span><span> 13</span> <span> * Action is the base class for all controller action classes.
</span><span> 14</span> <span> * 是所有控制器的基类
</span><span> 15</span> <span> * Action provides a way to divide a complex controller into
</span><span> 16</span> <span> * smaller actions in separate class files.
</span><span> 17</span> <span> * 控制器提供了一种重复使用操作方法的代码，在多个控制器或不同的项目中使用
</span><span> 18</span> <span> * Derived classes must implement a method named `run()`. This method
</span><span> 19</span> <span> * will be invoked by the controller when the action is requested.
</span><span> 20</span> <span> * The `run()` method can have parameters which will be filled up
</span><span> 21</span> <span> * with user input values automatically according to their names.
</span><span> 22</span> <span> * 派生类必须实现一个名为run()的方法，这个方法会在控制器被请求时调用。
</span><span> 23</span> <span> * 它可以有参数，将用户输入值的根据他们的名字自动填补。
</span><span> 24</span> <span> * For example, if the `run()` method is declared as follows:
</span><span> 25</span> <span> * 例：run()方法调用声明如下：
</span><span> 26</span> <span> * ~~~
</span><span> 27</span> <span> * public function run($id, $type = 'book') { ... }
</span><span> 28</span> <span> * ~~~
</span><span> 29</span> <span> *
</span><span> 30</span> <span> * And the parameters provided for the action are: `['id' => 1]`.
</span><span> 31</span> <span> * Then the `run()` method will be invoked as `run(1)` automatically.
</span><span> 32</span> <span> * 并且提供了操作的参数 ['id'=>1];
</span><span> 33</span> <span> * 当run(1)时自动调用run();
</span><span> 34</span> <span> * @property string $uniqueId The unique ID of this action among the whole application. This property is
</span><span> 35</span> <span> * read-only.
</span><span> 36</span> <span> * 整个应用程序中，这一行动的唯一标识。此属性是只读
</span><span> 37</span> <span> * @author Qiang Xue <qiang.xue@gmail.com>
</span><span> 38</span> <span> * @since 2.0
</span><span> 39</span> <span>*/</span>
<span> 40</span> <span>class</span><span> Action extends Component
</span><span> 41</span> <span>{
</span><span> 42</span> <span>/*</span><span>*
</span><span> 43</span> <span> * @var string ID of the action ID的动作
</span><span> 44</span> <span>*/</span>
<span> 45</span> <span>public</span><span> $id;
</span><span> 46</span> <span>/*</span><span>*
</span><span> 47</span> <span> * @var Controller|\yii\web\Controller the controller that owns this action
</span><span> 48</span> <span> * 拥有这一行动的控制器
</span><span> 49</span> <span>*/</span>
<span> 50</span> <span>public</span><span> $controller;
</span><span> 51</span>
<span> 52</span>
<span> 53</span> <span>/*</span><span>*
</span><span> 54</span> <span> * Constructor.
</span><span> 55</span> <span> * 构造函数
</span><span> 56</span> <span> * @param string $id the ID of this action 这一行动的ID
</span><span> 57</span> <span> * @param Controller $controller the controller that owns this action 拥有这一行动的控制器
</span><span> 58</span> <span> * @param array $config name-value pairs that will be used to initialize the object properties
</span><span> 59</span> <span> * 用来初始化对象属性的 name-value
</span><span> 60</span> <span>*/</span>
<span> 61</span> <span>public</span> function __construct($id, $controller, $config =<span> [])
</span><span> 62</span> <span> {
</span><span> 63</span> $<span>this</span>->id =<span> $id;
</span><span> 64</span> $<span>this</span>->controller =<span> $controller;
</span><span> 65</span> <span>//</span><span>调用父类的__construct()方法</span>
<span> 66</span> <span> parent::__construct($config);
</span><span> 67</span> <span> }
</span><span> 68</span>
<span> 69</span> <span>/*</span><span>*
</span><span> 70</span> <span> * Returns the unique ID of this action among the whole application.
</span><span> 71</span> <span> * 返回整个应用程序中的唯一ID。
</span><span> 72</span> <span> * @return string the unique ID of this action among the whole application.
</span><span> 73</span> <span> * 在整个应用程序中，这一行动的唯一ID。
</span><span> 74</span> <span>*/</span>
<span> 75</span> <span>public</span><span> function getUniqueId()
</span><span> 76</span> <span> {
</span><span> 77</span> <span>return</span> $<span>this</span>->controller->getUniqueId() . <span>'</span><span>/</span><span>'</span> . $<span>this</span>-><span>id;
</span><span> 78</span> <span> }
</span><span> 79</span>
<span> 80</span> <span>/*</span><span>*
</span><span> 81</span> <span> * Runs this action with the specified parameters. 用指定的参数运行此操作。
</span><span> 82</span> <span> * This method is mainly invoked by the controller. 该方法主要由控制器调用。
</span><span> 83</span> <span> *
</span><span> 84</span> <span> * @param array $params the parameters to be bound to the action's run() method.绑定到行动的run()方法的参数。
</span><span> 85</span> <span> * @return mixed the result of the action 行动的结果 命名参数是否有效的
</span><span> 86</span> <span> * @throws InvalidConfigException if the action class does not have a run() method
</span><span> 87</span> <span> * 如果动作类没有run()方法 扔出异常
</span><span> 88</span> <span>*/</span>
<span> 89</span> <span>public</span> function runWithParams($<span>params</span><span>)
</span><span> 90</span> <span> {
</span><span> 91</span> <span>if</span> (!method_exists($<span>this</span>, <span>'</span><span>run</span><span>'</span>)) {<span>//</span><span>如果动作类没有run()方法 抛出异常</span>
<span> 92</span> <span>throw</span> <span>new</span> InvalidConfigException(get_class($<span>this</span>) . <span>'</span><span> must define a "run()" method.</span><span>'</span><span>);
</span><span> 93</span> <span> }
</span><span> 94</span> <span>//</span><span>调用bindActionParams()方法将参数绑定到动作。</span>
<span> 95</span> $args = $<span>this</span>->controller->bindActionParams($<span>this</span>, $<span>params</span><span>);
</span><span> 96</span> <span>//</span><span>记录跟踪消息</span>
<span> 97</span> Yii::trace(<span>'</span><span>Running action: </span><span>'</span> . get_class($<span>this</span>) . <span>'</span><span>::run()</span><span>'</span><span>, __METHOD__);
</span><span> 98</span> <span>if</span> (Yii::$app->requestedParams === <span>null</span><span>) {
</span><span> 99</span> <span>//</span><span>请求的动作提供的参数</span>
<span>100</span> Yii::$app->requestedParams =<span> $args;
</span><span>101</span> <span> }
</span><span>102</span> <span>if</span> ($<span>this</span>-><span>beforeRun()) {
</span><span>103</span> <span>//</span><span>执行run()方法</span>
<span>104</span> $result = call_user_func_array([$<span>this</span>, <span>'</span><span>run</span><span>'</span><span>], $args);
</span><span>105</span> $<span>this</span>-><span>afterRun();
</span><span>106</span>
<span>107</span> <span>return</span><span> $result;
</span><span>108</span> } <span>else</span><span> {
</span><span>109</span> <span>return</span> <span>null</span><span>;
</span><span>110</span> <span> }
</span><span>111</span> <span> }
</span><span>112</span>
<span>113</span> <span>/*</span><span>*
</span><span>114</span> <span> * This method is called right before `run()` is executed.
</span><span>115</span> <span> * ` run() `执行前方法被调用。
</span><span>116</span> <span> * You may override this method to do preparation work for the action run.
</span><span>117</span> <span> * 可以重写此方法，为该操作运行的准备工作。
</span><span>118</span> <span> * If the method returns false, it will cancel the action.
</span><span>119</span> <span> * 如果该方法返回false，取消该操作。
</span><span>120</span> <span> * @return boolean whether to run the action.
</span><span>121</span> <span>*/</span>
<span>122</span> <span>protected</span><span> function beforeRun()
</span><span>123</span> <span> {
</span><span>124</span> <span>return</span> <span>true</span><span>;
</span><span>125</span> <span> }
</span><span>126</span>
<span>127</span> <span>/*</span><span>*
</span><span>128</span> <span> * This method is called right after `run()` is executed. ` run() `执行后 方法被调用。
</span><span>129</span> <span> * You may override this method to do post-processing work for the action run.
</span><span>130</span> <span> * 可以重写此方法来处理该动作的后续处理工作。
</span><span>131</span> <span>*/</span>
<span>132</span> <span>protected</span><span> function afterRun()
</span><span>133</span> <span> {
</span><span>134</span> <span> }
</span><span>135</span> }接下来我们看一下事件参数相关重要的一个类ActionEvent。yii2\base\ActionEvent.php
<span> 1</span> <?<span>php
</span><span> 2</span> <span>/*</span><span>*
</span><span> 3</span> <span> * @link </span><span>http://www.yiiframework.com/</span>
<span> 4</span> <span> * @copyright Copyright (c) 2008 Yii Software LLC
</span><span> 5</span> <span> * @license </span><span>http://www.yiiframework.com/license/</span>
<span> 6</span> <span>*/</span>
<span> 7</span>
<span> 8</span> <span>namespace</span> yii\<span>base</span><span>;
</span><span> 9</span>
<span>10</span> <span>/*</span><span>*
</span><span>11</span> <span> * ActionEvent represents the event parameter used for an action event.
</span><span>12</span> <span> * 用于操作事件的事件参数
</span><span>13</span> <span> * By setting the [[isValid]] property, one may control whether to continue running the action.
</span><span>14</span> <span> * 通过设置[[isValid]]属性，控制是否继续运行action。
</span><span>15</span> <span> * @author Qiang Xue <qiang.xue@gmail.com>
</span><span>16</span> <span> * @since 2.0
</span><span>17</span> <span>*/</span>
<span>18</span> <span>class</span><span> ActionEvent extends Event
</span><span>19</span> <span>{
</span><span>20</span> <span>/*</span><span>*
</span><span>21</span> <span> * @var Action the action currently being executed
</span><span>22</span> <span> * 目前正在执行的行动
</span><span>23</span> <span>*/</span>
<span>24</span> <span>public</span><span> $action;
</span><span>25</span> <span>/*</span><span>*
</span><span>26</span> <span> * @var mixed the action result. Event handlers may modify this property to change the action result.
</span><span>27</span> <span> * 操作结果 事件处理程序可以修改此属性来更改操作结果。
</span><span>28</span> <span>*/</span>
<span>29</span> <span>public</span><span> $result;
</span><span>30</span> <span>/*</span><span>*
</span><span>31</span> <span> * @var boolean whether to continue running the action. Event handlers of
</span><span>32</span> <span> * [[Controller::EVENT_BEFORE_ACTION]] may set this property to decide whether
</span><span>33</span> <span> * to continue running the current action.
</span><span>34</span> <span> * 是否继续运行该动作。设置[[Controller::EVENT_BEFORE_ACTION]]属性决定是否执行当前的操作
</span><span>35</span> <span>*/</span>
<span>36</span> <span>public</span> $isValid = <span>true</span><span>;
</span><span>37</span>
<span>38</span>
<span>39</span> <span>/*</span><span>*
</span><span>40</span> <span> * Constructor.构造函数。
</span><span>41</span> <span> * @param Action $action the action associated with this action event.与此事件相关联的动作。
</span><span>42</span> <span> * @param array $config name-value pairs that will be used to initialize the object properties
</span><span>43</span> <span> * 用来初始化对象属性的 name-value
</span><span>44</span> <span>*/</span>
<span>45</span> <span>public</span> function __construct($action, $config =<span> [])
</span><span>46</span> <span> {
</span><span>47</span> $<span>this</span>->action =<span> $action;
</span><span>48</span> <span> parent::__construct($config);
</span><span>49</span> <span> }
</span><span>50</span> }今天最后看一下操作过滤器的基类吧ActionFilter。yii2\base\ActionFilter.php。
<span> 1</span> <?<span>php
</span><span> 2</span> <span>/*</span><span>*
</span><span> 3</span> <span> * @link </span><span>http://www.yiiframework.com/</span>
<span> 4</span> <span> * @copyright Copyright (c) 2008 Yii Software LLC
</span><span> 5</span> <span> * @license </span><span>http://www.yiiframework.com/license/</span>
<span> 6</span> <span>*/</span>
<span> 7</span>
<span> 8</span> <span>namespace</span> yii\<span>base</span><span>;
</span><span> 9</span>
<span> 10</span> <span>/*</span><span>*
</span><span> 11</span> <span> * ActionFilter is the base class for action filters.
</span><span> 12</span> <span> * 是操作过滤器的基类。
</span><span> 13</span> <span> * An action filter will participate in the action execution workflow by responding to
</span><span> 14</span> <span> * the `beforeAction` and `afterAction` events triggered by modules and controllers.
</span><span> 15</span> <span> * 一个操作过滤器将参与行动的执行工作流程，通过触发模型和控制器的`beforeAction` 和`afterAction` 事件
</span><span> 16</span> <span> * Check implementation of [[\yii\filters\AccessControl]], [[\yii\filters\PageCache]] and [[\yii\filters\HttpCache]] as examples on how to use it.
</span><span> 17</span> <span> *
</span><span> 18</span> <span> * @author Qiang Xue <qiang.xue@gmail.com>
</span><span> 19</span> <span> * @since 2.0
</span><span> 20</span> <span>*/</span>
<span> 21</span> <span>class</span><span> ActionFilter extends Behavior
</span><span> 22</span> <span>{
</span><span> 23</span> <span>/*</span><span>*
</span><span> 24</span> <span> * @var array list of action IDs that this filter should apply to. If this property is not set,
</span><span> 25</span> <span> * then the filter applies to all actions, unless they are listed in [[except]].
</span><span> 26</span> <span> * 操作标识列表。如果该属性未设置，过滤器适用于所有的行动，除非它们被列入[[except]]中。
</span><span> 27</span> <span> * If an action ID appears in both [[only]] and [[except]], this filter will NOT apply to it.
</span><span> 28</span> <span> * 如果一个操作ID 出现在[[only]] 和[[except]]中，该筛选器将不适用它
</span><span> 29</span> <span> * Note that if the filter is attached to a module, the action IDs should also include child module IDs (if any)
</span><span> 30</span> <span> * and controller IDs.
</span><span> 31</span> <span> * 如果过滤器是链接到一个模块，操作检测还应包括子模块和控制器
</span><span> 32</span> <span> *
</span><span> 33</span> <span> * @see except
</span><span> 34</span> <span>*/</span>
<span> 35</span> <span>public</span><span> $only;
</span><span> 36</span> <span>/*</span><span>*
</span><span> 37</span> <span> * @var array list of action IDs that this filter should not apply to.
</span><span> 38</span> <span> * 此筛选器不应适用于操作ID。
</span><span> 39</span> <span> * @see only
</span><span> 40</span> <span>*/</span>
<span> 41</span> <span>public</span> $except =<span> [];
</span><span> 42</span>
<span> 43</span>
<span> 44</span> <span>/*</span><span>*
</span><span> 45</span> <span> * @inheritdoc
</span><span> 46</span> <span> * 将行为对象附加到组件。
</span><span> 47</span> <span>*/</span>
<span> 48</span> <span>public</span><span> function attach($owner)
</span><span> 49</span> <span> {
</span><span> 50</span> $<span>this</span>->owner =<span> $owner;
</span><span> 51</span> $owner->on(Controller::EVENT_BEFORE_ACTION, [$<span>this</span>, <span>'</span><span>beforeFilter</span><span>'</span><span>]);
</span><span> 52</span> <span> }
</span><span> 53</span>
<span> 54</span> <span>/*</span><span>*
</span><span> 55</span> <span> * @inheritdoc
</span><span> 56</span> <span> * 将行为对象和组件分离。
</span><span> 57</span> <span>*/</span>
<span> 58</span> <span>public</span><span> function detach()
</span><span> 59</span> <span> {
</span><span> 60</span> <span>if</span> ($<span>this</span>-><span>owner) {
</span><span> 61</span> $<span>this</span>->owner->off(Controller::EVENT_BEFORE_ACTION, [$<span>this</span>, <span>'</span><span>beforeFilter</span><span>'</span><span>]);
</span><span> 62</span> $<span>this</span>->owner->off(Controller::EVENT_AFTER_ACTION, [$<span>this</span>, <span>'</span><span>afterFilter</span><span>'</span><span>]);
</span><span> 63</span> $<span>this</span>->owner = <span>null</span><span>;
</span><span> 64</span> <span> }
</span><span> 65</span> <span> }
</span><span> 66</span>
<span> 67</span> <span>/*</span><span>*
</span><span> 68</span> <span> * @param ActionEvent $event 在动作之前调用
</span><span> 69</span> <span>*/</span>
<span> 70</span> <span>public</span> function beforeFilter($<span>event</span><span>)
</span><span> 71</span> <span> {
</span><span> 72</span> <span>if</span> (!$<span>this</span>->isActive($<span>event</span>-><span>action)) {
</span><span> 73</span> <span>return</span><span>;
</span><span> 74</span> <span> }
</span><span> 75</span>
<span> 76</span> $<span>event</span>->isValid = $<span>this</span>->beforeAction($<span>event</span>-><span>action);
</span><span> 77</span> <span>if</span> ($<span>event</span>-><span>isValid) {
</span><span> 78</span> <span>//</span><span> call afterFilter only if beforeFilter succeeds beforeFilter 执行成功调用afterFilter
</span><span> 79</span> <span>//</span><span> beforeFilter and afterFilter should be properly nested 两者要配合应用</span>
<span> 80</span> $<span>this</span>->owner->on(Controller::EVENT_AFTER_ACTION, [$<span>this</span>, <span>'</span><span>afterFilter</span><span>'</span>], <span>null</span>, <span>false</span><span>);
</span><span> 81</span> } <span>else</span><span> {
</span><span> 82</span> $<span>event</span>->handled = <span>true</span><span>;
</span><span> 83</span> <span> }
</span><span> 84</span> <span> }
</span><span> 85</span>
<span> 86</span> <span>/*</span><span>*
</span><span> 87</span> <span> * @param ActionEvent $event
</span><span> 88</span> <span>*/</span>
<span> 89</span> <span>public</span> function afterFilter($<span>event</span><span>)
</span><span> 90</span> <span> {
</span><span> 91</span> $<span>event</span>->result = $<span>this</span>->afterAction($<span>event</span>->action, $<span>event</span>-><span>result);
</span><span> 92</span> $<span>this</span>->owner->off(Controller::EVENT_AFTER_ACTION, [$<span>this</span>, <span>'</span><span>afterFilter</span><span>'</span><span>]);
</span><span> 93</span> <span> }
</span><span> 94</span>
<span> 95</span> <span>/*</span><span>*
</span><span> 96</span> <span> * This method is invoked right before an action is to be executed (after all possible filters.)
</span><span> 97</span> <span> * 此方法是在一个动作之前被调用的（
</span><span> 98</span> <span> * You may override this method to do last-minute preparation for the action.
</span><span> 99</span> <span> * @param Action $action the action to be executed.要执行的动作
</span><span>100</span> <span> * @return boolean whether the action should continue to be executed.
</span><span>101</span> <span> * 是否应继续执行该动作。
</span><span>102</span> <span>*/</span>
<span>103</span> <span>public</span><span> function beforeAction($action)
</span><span>104</span> <span> {
</span><span>105</span> <span>return</span> <span>true</span><span>;
</span><span>106</span> <span> }
</span><span>107</span>
<span>108</span> <span>/*</span><span>*
</span><span>109</span> <span> * This method is invoked right after an action is executed.
</span><span>110</span> <span> * 此方法是在执行动作之后调用的。
</span><span>111</span> <span> * You may override this method to do some postprocessing for the action.
</span><span>112</span> <span> * @param Action $action the action just executed. 刚刚执行的动作
</span><span>113</span> <span> * @param mixed $result the action execution result 行动执行结果
</span><span>114</span> <span> * @return mixed the processed action result. 处理结果。
</span><span>115</span> <span>*/</span>
<span>116</span> <span>public</span><span> function afterAction($action, $result)
</span><span>117</span> <span> {
</span><span>118</span> <span>return</span><span> $result;
</span><span>119</span> <span> }
</span><span>120</span>
<span>121</span> <span>/*</span><span>*
</span><span>122</span> <span> * Returns a value indicating whether the filer is active for the given action.
</span><span>123</span> <span> * 返回一个值，给定的过滤器的行动是否为是积极的。
</span><span>124</span> <span> * @param Action $action the action being filtered 被过滤的动作
</span><span>125</span> <span> * @return boolean whether the filer is active for the given action.
</span><span>126</span> <span> * 给定的过滤器的行动是否为是积极的。
</span><span>127</span> <span>*/</span>
<span>128</span> <span>protected</span><span> function isActive($action)
</span><span>129</span> <span> {
</span><span>130</span> <span>if</span> ($<span>this</span>-><span>owner instanceof Module) {
</span><span>131</span> <span>//</span><span> convert action uniqueId into an ID relative to the module</span>
<span>132</span> $mid = $<span>this</span>->owner-><span>getUniqueId();
</span><span>133</span> $id = $action-><span>getUniqueId();
</span><span>134</span> <span>if</span> ($mid !== <span>''</span> && strpos($id, $mid) === <span>0</span><span>) {
</span><span>135</span> $id = substr($id, strlen($mid) + <span>1</span><span>);
</span><span>136</span> <span> }
</span><span>137</span> } <span>else</span><span> {
</span><span>138</span> $id = $action-><span>id;
</span><span>139</span> <span> }
</span><span>140</span> <span>return</span> !in_array($id, $<span>this</span>->except, <span>true</span>) && (empty($<span>this</span>->only) || in_array($id, $<span>this</span>->only, <span>true</span><span>));
</span><span>141</span> <span> }
</span><span>142</span> }
Lösung zum Neustarten und Auswählen des richtigen Startgeräts
So öffnen Sie eine URL-Datei
PS Farbeimer-Tastenkombinationen
Was ist mit dem roten Licht am Lichtsignal los?
So lösen Sie das Problem, dass die Datei msxml6.dll fehlt
Metasuchmaschine
So wechseln Sie zwischen voller und halber Breite
Verwendung des js-Shift-Operators
![[Web-Frontend] Node.js-Schnellstart](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
