How to use thinkphp fetch method

Fetch method in ThinkPHP framework is a rendering method that is primarily used to load view pages and render them.. First find the View class in the ThinkPHP framework, because this method is defined in this class.

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. In the View.php source file, there is a View class, which defines the code of the fetch() method, as shown below:

/**
 * 渲染模板输出
 * @access public
 * @param string    $templateFile 模板文件名
 * @param array     $vars         模板输出变量
 * @param array     $config       模板参数
 * @return void
 * @throws Exception
 */
public function fetch($templateFile = '', $vars = [], $config = [])
{
    // 将变量赋值到视图模板中
    if (!empty($vars)) {
        $this->assign($vars);
    }

    // 处理模板文件名并判断是否存在
    $templateFile = $this->parseTemplateFile($templateFile);

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

    // 模板输出过滤
    $this->filter($templateFile);

    // 解析视图模板中的函数
    $content = $this->fetchParse($templateFile, $config);

    // 视图模板编译缓存
    if ($this->config('tpl_cache') && !empty($TemplateCache)) {
        $TemplateCache->set($cacheFile, $content);
    }

    // 返回解析后的视图模板内容
    return $content;
}

In this code, we can see the definition and details of the fetch method accomplish.

In the fetch method, we first use the assign method to pass the template variable and the name of the template file to be rendered for variable assignment. Then determine whether the template file exists, and throw an exception if it does not exist. Finally, the view template output is filtered, the functions in the view template are parsed and the processed content is returned.

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