think\Template::compiler PHP Method

    private function compiler(&$content, $cacheFile)
    {
        // 判断是否启用布局
        if ($this->config['layout_on']) {
            if (false !== strpos($content, '{__NOLAYOUT__}')) {
                // 可以单独定义不使用布局
                $content = str_replace('{__NOLAYOUT__}', '', $content);
            } else {
                // 读取布局模板
                $layoutFile = $this->parseTemplateFile($this->config['layout_name']);
                if ($layoutFile) {
                    // 替换布局的主体内容
                    $content = str_replace($this->config['layout_item'], $content, file_get_contents($layoutFile));
                }
            }
        } else {
            $content = str_replace('{__NOLAYOUT__}', '', $content);
        }
        // 模板解析
        $this->parse($content);
        if ($this->config['strip_space']) {
            /* 去除html空格与换行 */
            $find = ['~>\\s+<~', '~>(\\s+\\n|\\r)~'];
            $replace = ['><', '>'];
            $content = preg_replace($find, $replace, $content);
        }
        // 优化生成的php代码
        $content = preg_replace('/\\?>\\s*<\\?php\\s(?!echo\\b)/s', '', $content);
        // 模板过滤输出
        $replace = $this->config['tpl_replace_string'];
        $content = str_replace(array_keys($replace), array_values($replace), $content);
        // 添加安全代码及模板引用记录
        $content = '<?php if (!defined(\'THINK_PATH\')) exit(); /*' . serialize($this->includeFile) . '*/ ?>' . "\n" . $content;
        // 编译存储
        $this->storage->write($cacheFile, $content);
        $this->includeFile = [];
        return;
    }