PHP understands the implementation principle by writing a template class yourself

I believe many PHPers have come into contact with templates. How are templates implemented with their specific parsing syntax? This article lets everyone clearly understand the principle of templates by writing a simple template parsing class.

miniClass

class mini {
    public $template_dir = ''; // 模板文件存放的位置
    public $compile_dir = ''; // 模板文件编译后存放的位置
    public $array = array ();
    public function assign($key, $value) {
        $this->array [$key] = $value;
    }
    /*
     * 调动compile来编译模板，并自动引入；
     */
    public function display($template) {
        $comp = $this->compile ( $template );
        include ($comp);
    }
    /*
     * 传一个参数，读取那个html模板 流程：把模板读取过来，编译成php
     */
    public function compile($template) {
        // $template是一个html文件
        $temp = $this->template_dir . '/' . $template;
        $source = file_get_contents ( $temp );
        // 再把编译后的内容保存成.php文件
        $comp = $this->compile_dir . '/' . $template . '.php';
        // 判断模板是否已经存在，或者修改；
        if (file_exists ( $comp ) && filemtime ( $temp ) < filemtime ( $comp )) {
            return $comp;
        }
        $source = str_replace ( &#39;{$&#39;, &#39;<?php echo $this->array[\&#39;&#39;, $source );
        $source = str_replace ( &#39;}&#39;, &#39;\&#39;];?>&#39;, $source );
        // echo $source;
        file_put_contents ( $comp, $source );
        return $comp;
    }
}

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