ThinkPHP framework is a PHP framework based on the MVC design pattern, which integrates many excellent features of PHP. During the development process, we often need to use the thinkphp fetch method to render the view, but in which file is the fetch method located?

First of all, the fetch method is a rendering method in the ThinkPHP framework. This method is mainly used to load the view page and render it. This method is defined in the View class of the ThinkPHP framework, therefore, we need to find the View class first.

The path of the View class in the ThinkPHP framework is as follows:

thinkphp/library/think/View.php

We can find the source code file where the View class is located through this path. Open the View.php source file, we can see that the fetch() method is defined in the View class, and its code is as follows:

/**
?*?渲染模板輸出
?*?@access?public
?*?@param?string????$templateFile?模板文件名
?*?@param?array?????$vars?????????模板輸出變量
?*?@param?array?????$config???????模板參數(shù)
?*?@return?void
?*?@throws?Exception
?*/
public?function?fetch($templateFile?=?'',?$vars?=?[],?$config?=?[])
{
????//?將變量賦值到視圖模板中
????if?(!empty($vars))?{
????????$this->assign($vars);
????}

????//?處理模板文件名并判斷是否存在
????$templateFile?=?$this->parseTemplateFile($templateFile);

????if?(!is_file($templateFile))?{
????????throw?new?Exception('template?file?not?exists:'?.?$templateFile);
????}

????//?模板輸出過濾
????$this->filter($templateFile);

????//?解析視圖模板中的函數(shù)
????$content?=?$this->fetchParse($templateFile,?$config);

????//?視圖模板編譯緩存
????if?($this->config('tpl_cache')?&&?!empty($TemplateCache))?{
????????$TemplateCache->set($cacheFile,?$content);
????}

????//?返回解析后的視圖模板內容
????return?$content;
}

In this code, we can see the definition and specific implementation of the fetch method .

In the fetch method, first the template file name to be rendered and the view template variable are passed to the assign method for variable assignment. Then determine whether the template file exists, and throw an exception if it does not exist. Then perform view template output filtering, and finally parse the function in the view template and return the parsed content.

In summary, the fetch method is defined in the View class of the ThinkPHP framework. It is a rendering method used to load the view page and render it. When developers use the ThinkPHP framework, they can render the view template through the fetch method in the View class.

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