Yii2 Source Learning Notes (19), Yii2 Source Learning notes _php Tutorial

Yii2 Source Learning Notes (19), Yii2 Source Learning notes

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1     /**2 * @return String|boolean The view file currently being rendered. False If no view file is being rendered.3 * The view file currently being rendered4      */5      Publicfunction Getviewfile ()6     {7         returnEnd ($ This-_viewfiles);8     }9 Ten     /** One * This method was invoked right before [[[RenderFile ()]] renders a view file. A * The default implementation would trigger the [[Event_before_render]] EVENT. - * Pre-event, called when executing [RenderFile ()], default trigger [[Event_before_render]] event - * If You override this method and make sure your call the parent implementation first. the * @param string $viewFile The view file to be rendered. The Views files to render.  - * @param array $params The parameter array passed to the [[Render ()]] method. - * The parameter array is passed to the [render ()] method.  - * @return The Boolean whether to continue rendering the view file.  +      */ -      Publicfunction BeforeRender ($viewFile, $params) +     { A$Event=NewViewEvent ([//Instantiate ViewEvent at             'Viewfile'=$viewFile, -             'params'= = $params, -         ]); -$ This->trigger (Self::event_before_render, $Event);//Trigger [Event_before_render] Event -  -         return$Event->isvalid;//determine whether to continue rendering the file in     } -  to     /** + * This method was invoked right after [[RenderFile ()]] renders a view file. - * The default implementation would trigger the [[Event_after_render]] EVENT. the * Post-event, called after the [RenderFile ()] method is executed, the [[Event_after_render]] event is triggered by default * * If You override this method and make sure your call the parent implementation first. $ * @param string $viewFile The view file being rendered. Panax Notoginseng * @param array $params The parameter array passed to the [[Render ()]] method. - * The parameter array is passed to the [render ()] method.  the * @param string $output The rendering result of the view file. Updates to this parameter + * 'll be passed back and returned by [[RenderFile ()]]. A * Returns the result of view rendering the      */ +      Publicfunction AfterRender ($viewFile, $params, &$output) -     { $         if($ This->haseventhandlers (Self::event_after_render)) {//determine if [Event_after_render] event exists $$Event=NewViewEvent ([ -                 'Viewfile'=$viewFile, -                 'params'= = $params, the                 'Output'=$output, -             ]);Wuyi             //Trigger [Event_after_render] Event the$ This->trigger (Self::event_after_render, $Event); -$output = $Event->output;//return Results Wu         } -     } About  $     /** - * Renders a view file as a PHP script. - * Returns a view file as a PHP script - * This method treats the view file as a PHP script and includes the file. A * It extracts the given parameters and makes them available in the view file. + * The method captures the output of the included view file and returns it as a string. the * Convert incoming parameter to variable, include and execute view file, return execution result - * This method should mainly is called by View renderer or [[RenderFile ()]]. $      * the * @param string $_file_ The view file. the * @param array $_params_ The parameters (Name-value pairs) that would be extracted and made available in the view File. the * @return string The rendering result execution results the      */ -      Publicfunction Renderphpfile ($_file_, $_params_ = []) in     { theOb_start ();//turn on output buffering theOb_implicit_flush (false);//Close Buffer AboutExtract ($_params_, extr_overwrite);//converts an array to a variable using the the require ($_file_); the          the         returnOb_get_clean ();//gets the contents of the buffer area and clears the current output buffer +     } -  the     /**Bayi * Renders dynamic content returned by the given PHP statements. the * This method was mainly used together with content caching (fragment caching and page caching) the * Used to aggregate cached content - * When some portions of the content (called *dynamic content*) should isn't be cached. - * The dynamic content must is returned by some PHP statements. the * Render some dynamic content returned by a PHP statement the * @param string $statements The dynamic content of the PHP statements for generating. Generates a PHP statement that dynamically contents.  the * @return String The placeholder of the dynamic content, or the dynamic content if there is no the * Active Contents cache currently. Dynamic content placeholder Call Evaluatedynamiccontent Output If there is currently no valid content cache -      */ the      Publicfunction renderdynamic ($statements) the     { the         if(!empty ($ This->cachestack)) {//the list of dynamic content is not empty94$n = Count ($ This->dynamicplaceholders);//Statistics Dynamic Content bar number the$placeholder ="YII-DYNAMIC-$n";//Generate placeholders the$ This->adddynamicplaceholder ($placeholder, $statements);//Add a dynamic content placeholder the 98             return$placeholder; About}Else{//no valid cache executes the incoming PHP statement, returning the execution result -             return$ This-evaluatedynamiccontent ($statements);101         }102     }103 104     /** the * Adds A placeholder for dynamic contents. Add a dynamic content placeholder106 * This method is internally used. Internal Use107 * @param string $placeholder The placeholder name placeholder108 * @param string $statements The PHP statements for generating the dynamic content109 * PHP statements that generate dynamic content the      */111      Publicfunction Adddynamicplaceholder ($placeholder, $statements) the     {113         foreach($ This->cachestack as$cache) { the$cache->dynamicplaceholders[$placeholder] = $statements;//Add a dynamic content placeholder the         } the$ This->dynamicplaceholders[$placeholder] = $statements;//Add a dynamic content placeholder to the current view117     }118 119     /** - * Evaluates the given PHP statements. The value of the given PHP statement121 * This method was mainly used internally to implement dynamic content feature122 * @param string $statements The PHP statements to be evaluated. PHP Statement for calculation123 * @return Mixed the return value of the PHP statements. The value of the PHP statement124      */ the      Publicfunction Evaluatedynamiccontent ($statements)126     {127         returneval ($statements); -     }129  the     /**131 * begins recording a block. the * This method was a shortcut to beginning [[Block]]133 * Data Block start tag, this method is the shortcut to start [block]134 * Data blocks can be specified in one place the view content is displayed in another place, usually with the layout135 * @param string $id The block ID. Data Block identification136 * @param Boolean $renderInPlace whether to render the block contents in place. Whether to render chunk content. 137 * Defaults to False, meaning the captured block won't be displayed.138 * @return block The Block widget instance block widget instance139      */ $      Publicfunction Beginblock ($id, $renderInPlace =false)141     {142         returnBlock::begin ([143             'ID'= $id,//data block Unique identification144             'Renderinplace'= $renderInPlace,//whether the identity is displayed145             'View'= = $ This,146         ]);147     }148 149     /** Max * Ends Recording a block. Data Block End identification151      */ the      Publicfunction Endblock ()153     {154 block::end ();155     }156 157     /**158 * Begins the rendering of content is decorated by the specified view.159 * This method can is used to implement nested layout. For example, a layout can embedded the * In another layout file specified as ' @app/views/layouts/base.php ' like the following:161 * Start the specified view render content, used to implement the nested layout, the first parameter passed to the path of the layout file162      * ~~~163 * 
    begincontent (' @app/views/layouts/base.php ');?>164 * ... layout content here ...165 * 
    endcontent ();?>166      * ~~~167      *168 * @param string $viewFile The view file that'll be used to decorate the content enclosed by this widget.169 * This can be specified as either the path or path alias of the view file path or path alias.  the * @param array $params the variables (name = value) to being extracted and made available in the decorative Vie W.171 * Parameters that can be used in the view172 * @return Contentdecorator the Contentdecorator widget instance part instance173 * @see Contentdecorator174      */175      Publicfunction Begincontent ($viewFile, $params= [])176     {177         returnContentdecorator::begin ([178             'Viewfile'=$viewFile,179             'params'= = $params, the             'View'= = $ This,181         ]);182     }183 184     /**185 * Ends the rendering of content. End Rendering186      */187      Publicfunction endcontent ()188     {189 contentdecorator::end (); the     }191 192     /**193 * begins fragment caching. Start Fragment Cache194 * This method would display cached content if it is available.195 * If not, it'll start caching and would expect an [[Endcache ()]]196 * Call to end the cache and save the content into cache.197 * Display the available cache content, otherwise the cache content will start until the [Endcache ()] method appears198 * A Typical usage of fragment caching is as follows,199      * $      * ~~~201 * if ($this->begincache ($id)) {202 *//... generate content here203 * $this->endcache ();204      * }205      * ~~~206      *207 * @param string $id a unique ID identifying the fragment to be cached. Unique identifier of the cache fragment208 * @param array $properties initial property values for [[FragmentCache]] initial properties [FragmentCache]209 * @return Boolean whether you should generate the contents for caching. Whether to generate cached content.  About * False If the cached version is available.211      */212      Publicfunction Begincache ($id, $properties = [])213     {214$properties ['ID'] = $id;//Fragment Identification215$properties ['View'] = $ This;//Invoking initialization Properties216         /*@var $cache FragmentCache*/217$cache =Fragmentcache::begin ($properties);218         if($cache->getcachedcontent ()!==false) {219$ This->endcache ();//reads the cached content from the cache, renders the content and returns false, no longer caches - 221             return false;222}Else {223             return true;224         }225     }226 227     /**228 * Ends fragment caching. End Fragment Cache229      */ the      Publicfunction Endcache ()231     {232 fragmentcache::end ();233     }234 235     /**236 * Marks The beginning of a page. Start tag237      */238      Publicfunction beginpage ()239     { -Ob_start ();//turn on output buffering241Ob_implicit_flush (false);//Close Buffer242 243$ This-trigger (self::event_begin_page);244     }245 246     /**247 * Marks The ending of a page. End tag248      */249      Publicfunction EndPage () -     {251$ This-trigger (self::event_end_page);252Ob_end_flush ();//Close Output Buffers253}

http://www.bkjia.com/PHPjc/1137013.html www.bkjia.com true http://www.bkjia.com/PHPjc/1137013.html techarticle yii2 Source Learning notes (19), Yii2 Source Learning notes View remaining code 1/* * 2 * @return String|boolean The view file currently being rendered. False If no view file is being ...

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